| 释义 |
ballast
bal·last B0043200 (băl′əst)n.1. Heavy material that is carried to improve stability or maintain proper trim, as on a ship, or to limit buoyancy, as on a balloon.2. a. Coarse gravel or crushed rock laid to form a bed for roads or railroads.b. The gravel ingredient of concrete.3. Something that gives stability, especially in character.tr.v. bal·last·ed, bal·last·ing, bal·lasts 1. To stabilize or provide with ballast.2. To fill (a railroad bed) with or as if with ballast.
[Perhaps from Old Swedish or Old Danish barlast : bar, mere, bare; see bhoso- in Indo-European roots + last, load.]ballast (ˈbæləst) n1. (Nautical Terms) any dense heavy material, such as lead or iron pigs, used to stabilize a vessel, esp one that is not carrying cargo2. (Civil Engineering) crushed rock, broken stone, etc, used for the foundation of a road or railway track3. (Building) coarse aggregate of sandy gravel, used in making concrete4. anything that provides stability or weight5. (Electronics) electronics a device for maintaining the current in a circuitvb (tr) to give stability or weight to[C16: probably from Low German; related to Old Danish, Old Swedish barlast, literally: bare load (without commercial value), from bar bare, mere + last load, burden]bal•last (ˈbæl əst)
n. 1. a heavy material carried on a vessel to control draft and stability or a balloon to control altitude. 2. gravel or broken stone placed under the ties of a railroad. 3. a device that maintains the current in an electric circuit at a constant value and may also provide the starting voltage, as in a fluorescent lamp. v.t. 4. to furnish with ballast. [1520–30; < Middle Low German, perhaps ultimately < Scandinavian; compare early Dan and Swedish barlast=bar bare1 + last load] bal′last•er, n. ballast
Past participle: ballasted
Gerund: ballasting
| Present |
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| I ballast | | you ballast | | he/she/it ballasts | | we ballast | | you ballast | | they ballast |
| Preterite |
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| I ballasted | | you ballasted | | he/she/it ballasted | | we ballasted | | you ballasted | | they ballasted |
| Present Continuous |
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| I am ballasting | | you are ballasting | | he/she/it is ballasting | | we are ballasting | | you are ballasting | | they are ballasting |
| Present Perfect |
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| I have ballasted | | you have ballasted | | he/she/it has ballasted | | we have ballasted | | you have ballasted | | they have ballasted |
| Past Continuous |
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| I was ballasting | | you were ballasting | | he/she/it was ballasting | | we were ballasting | | you were ballasting | | they were ballasting |
| Past Perfect |
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| I had ballasted | | you had ballasted | | he/she/it had ballasted | | we had ballasted | | you had ballasted | | they had ballasted |
| Future |
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| I will ballast | | you will ballast | | he/she/it will ballast | | we will ballast | | you will ballast | | they will ballast |
| Future Perfect |
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| I will have ballasted | | you will have ballasted | | he/she/it will have ballasted | | we will have ballasted | | you will have ballasted | | they will have ballasted |
| Future Continuous |
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| I will be ballasting | | you will be ballasting | | he/she/it will be ballasting | | we will be ballasting | | you will be ballasting | | they will be ballasting |
| Present Perfect Continuous |
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| I have been ballasting | | you have been ballasting | | he/she/it has been ballasting | | we have been ballasting | | you have been ballasting | | they have been ballasting |
| Future Perfect Continuous |
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| I will have been ballasting | | you will have been ballasting | | he/she/it will have been ballasting | | we will have been ballasting | | you will have been ballasting | | they will have been ballasting |
| Past Perfect Continuous |
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| I had been ballasting | | you had been ballasting | | he/she/it had been ballasting | | we had been ballasting | | you had been ballasting | | they had been ballasting |
| Conditional |
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| I would ballast | | you would ballast | | he/she/it would ballast | | we would ballast | | you would ballast | | they would ballast |
| Past Conditional |
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| I would have ballasted | | you would have ballasted | | he/she/it would have ballasted | | we would have ballasted | | you would have ballasted | | they would have ballasted |
Thesaurus| Noun | 1. |  ballast - any heavy material used to stabilize a ship or airshipmaterial, stuff - the tangible substance that goes into the makeup of a physical object; "coal is a hard black material"; "wheat is the stuff they use to make bread" | | 2. |  ballast - coarse gravel laid to form a bed for streets and railroadscrushed rock, gravel - rock fragments and pebbles | | 3. | ballast - an attribute that tends to give stability in character and morals; something that steadies the mind or feelingsattribute - an abstraction belonging to or characteristic of an entity | | 4. |  ballast - a resistor inserted into a circuit to compensate for changes (as those arising from temperature fluctuations)ballast resistor, barretterresistor, resistance - an electrical device that resists the flow of electrical current | | 5. | ballast - an electrical device for starting and regulating fluorescent and discharge lampslight ballastelectrical device - a device that produces or is powered by electricity | | Verb | 1. | ballast - make steady with a ballaststabilise, stabilize, steady, brace - support or hold steady and make steadfast, with or as if with a brace; "brace your elbows while working on the potter's wheel" |
ballastnoun counterbalance, balance, weight, stability, equilibrium, sandbag, counterweight, stabilizer She may have to discharge some ballast to make her lighter.Translationszavorrazavorraremassicciataballastballastbedbeddingballastballasteballast
ballast1. any dense heavy material, such as lead or iron pigs, used to stabilize a vessel, esp one that is not carrying cargo 2. crushed rock, broken stone, etc., used for the foundation of a road or railway track 3. Electronics a device for maintaining the current in a circuit BallastPower-regulating device that modifies input voltage and controls current to provide the electrical conditions necessary to start and operate gaseous discharge lamps, especially fluorescents and HID (high-intensity discharge) lamps.ballast[′bal·əst] (aerospace engineering) A relatively dense substance that is placed in the cab of a balloon and can be thrown out to reduce the load or can be shifted to change the center of gravity. (civil engineering) Crushed stone used in a railroad bed to support the ties, hold the track in line, and help drainage. (electricity) A circuit element that serves to limit an electric current or to provide a starting voltage, as in certain types of lamps, such as in fluorescent ceiling fixtures. (materials) Coarse gravel used as an ingredient in concrete. (naval architecture) A relatively heavy material such as lead, iron, or water placed in a ship to ensure stability or to maintain the proper draft or trim. To pump seawater into empty fuel tanks of a ship to ensure its stability or suitable draft and trim for seaworthiness. ballast1. Coarse stone, gravel, slag, etc., used as an underlayer for poured concrete. 2. A device used to provide the required starting voltage and operating current for fluorescent, mercury, or other electric-discharge lamps. 3. Class P: A ballast for a fluorescent lamp which meets the requirements of the Underwriters’ Laboratories, Inc.; includes an automatic resetting thermal protector to remove the ballast from the circuit if its temperature exceeds a specified value. 4. Same as constant-wattage ballast.ballastWeight installed in an airplane to ensure that the center of gravity is always within the permissible limits. In some aircraft, fuel is used as a ballast. This fuel, however, cannot be burned by the aircraft.ballast
ballast (bal'ăst), 1. Material of doubtful value itself used to stabilize something (for example, maritime practice). 2. Something largely without intrinsic value.ballast Additional weight of material incorporated in a part of a contact lens to maintain it in a given orientation (Fig. B1). This is often provided by giving prismatic power to the lens (prism ballast lens). " > Fig. B1 Truncated and prism-ballasted toric contact lensBallast
BallastInformal; anything that helps bring balance to an economy or company. For example, if strong auto sales lift an otherwise stagnant economy, it may be said to be a ballast preserving GDP growth. The term refers to the weight that helps balance a ship at sea.See BALL
BALLAST
| Acronym | Definition |
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| BALLAST➣Balanced Loading Via Automated Stability & Trim |
ballast
Related to ballast: Electrical ballastSynonyms for ballastnoun counterbalanceSynonyms- counterbalance
- balance
- weight
- stability
- equilibrium
- sandbag
- counterweight
- stabilizer
Synonyms for ballastnoun any heavy material used to stabilize a ship or airshipRelated Wordsnoun coarse gravel laid to form a bed for streets and railroadsRelated Wordsnoun an attribute that tends to give stability in character and moralsRelated Wordsnoun a resistor inserted into a circuit to compensate for changes (as those arising from temperature fluctuations)Synonyms- ballast resistor
- barretter
Related Wordsnoun an electrical device for starting and regulating fluorescent and discharge lampsSynonymsRelated Wordsverb make steady with a ballastRelated Words- stabilise
- stabilize
- steady
- brace
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