| 单词 | concentration |
| 释义 | concentration (once / 671 pages) 1n 2n If you have great powers of concentration, that means you're able to focus all your attention on the matter at hand. Concentration can also refer to something that's clustered together or to the density or strength of a solution. A concentration of people means that there are many of them in one area. Your city may have a concentration of artists living in the warehouses by the river. A high concentration of a substance in a solution means that there's a lot of it relative to the volume: the Great Salt Lake has very few fish because of the high concentration of salt. To say that you have good concentration skills means that you pay attention well. WORD FAMILYconcentration: concentrations+/concentrate: concentrated, concentrates, concentrating, concentration, deconcentrate/concentrated: concentratedly/deconcentrate: deconcentrated, deconcentrating USAGE EXAMPLESAn effort is underway in the state to lower the legal blood-alcohol concentration for driving to .05 — a first in the nation. Los Angeles Times(Jan 01, 2017) The unusually warm conditions fit into a long-term trend fueled by ever-increasing greenhouse gas concentrations resulting from human activities. Washington Post(Dec 30, 2016) Dr. Veach said a hangover occurs when the concentration of alcohol in one’s system is decreasing. New York Times(Dec 30, 2016) 1 1n the spatial property of being crowded together Syn|Ant|Hyper compactness, denseness, density, tightness dispersion, distribution the spatial or geographic property of being scattered about over a range, area, or volume spacing, spatial arrangement the property possessed by an array of things that have space between them 2n an increase in density Hypo|Hyper compaction, compression, concretion, densification an increase in the density of something rarefactiona decrease in the density of something increase a change resulting in an increase 3n the strength of a solution; number of molecules of a substance in a given volume Hypo|Hyper titer, titre the concentration of a solution as determined by titration hydrogen ion concentrationthe number of moles of hydrogen ions per cubic decimeter molal concentration, molalityconcentration measured by the number of moles of solute per kilogram of solvent M, molar concentration, molarityconcentration measured by the number of moles of solute per liter of solution pH, pH scale(from potential of Hydrogen) the logarithm of the reciprocal of hydrogen-ion concentration in gram atoms per liter; provides a measure on a scale from 0 to 14 of the acidity or alkalinity of a solution (where 7 is neutral and greater than 7 is more basic and less than 7 is more acidic); property a basic or essential attribute shared by all members of a class 4n strengthening the concentration (as of a solute in a mixture) by removing diluting material Ant|Hypo|Hyper dilution weakening (reducing the concentration) by the addition of water or a thinner pervaporation the concentration of a colloidal solution whose colloid will not pass through a semipermeable membrane; solution is placed in a bag of the membrane and the solvent is evaporated off strengthening the act of increasing the strength of something 5n bringing together military forces 2Hyper assemblage, assembly, gathering the social act of assembling 1n complete attention; intense mental effort Syn|Hypo|Hyper absorption, engrossment, immersion centering, direction, focal point, focus, focusing, focussing the concentration of attention or energy on something specialismthe concentration of your efforts on a particular field of study or occupation studya state of deep mental absorption particularisma focus on something particular attention the faculty or power of mental concentration 2n great and constant diligence and attention Syn|Hypo|Hyper assiduity, assiduousness engrossment, intentness the quality of being intent and concentrated singlenessthe quality of concentrating on one central objective diligence, industriousness, industry persevering determination to perform a task |
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