| 单词 | ballast | 
| 释义 | ballast1 of 2noun  bal·last  ˈba-ləst  1   : a heavy substance (such as rocks or water) placed in such a way as to improve stability and control (as of the draft of a ship or the buoyancy of a balloon or submarine)  tossed several tons of ballast overboard 2   : something that gives stability (as in character or conduct)  She provided the ballast we needed during stressful times. 3   : gravel or broken stone laid in a railroad bed or used in making concrete   4   : a device used to provide the starting voltage or to stabilize the current in a circuit (as of a fluorescent lamp)   ballast2 of 2 verb  ballasted; ballasting; ballasts   transitive verb 1   : to steady or equip with or as if with ballast  They ballast the canoe with large rocks. 2   : to fill in (something, such as a railroad bed) with ballast (see ballast entry 1 sense 3)   ballast nounas in cargoheavy material (such as rocks or water) that is put on a ship to make it steady or on a balloon to control its height in the air  —often used figuratively A large amount of ballast kept the boat from capsizing. She provided the ballast the family needed in times of stress. Synonyms & Similar Words Relevance 
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