1
- no obj. focus all one's attention or mental effort on a particular object or activity全神贯注; 全力以赴; 聚精会神：
she couldn't concentrate on the film
她无法全神贯注地看这部电影
with obj. a threatened tax rise concentrates the mind wonderfully.要增税的扬言奇迹般地使人们全神贯注起来。
1.1
concentrate on/upon
do or deal with (one particular thing) above all others首要处理（某事）; 注重：Luke wants to concentrate on his film career.
卢克想集中精力拓展他的电影生涯。
2
- with obj.（常作be concentrated）gather (people or things) together in numbers or a mass to one point集中（人, 事物）（于一处）; 聚集：
power was concentrated in the hands of the ruling Politburo.
权力集中在执政的政治局手里。
2.1
- no obj. come together in this way集中; 集合; 聚集：
troops were concentrating at the western front.
军队在西线集结。
2.2
- increase the strength or proportion of (a substance or solution) by removing or reducing the water or other diluting agent or by selective accumulation of atoms or molecules浓缩：
plants and micro-organisms can concentrate metals from the environment.
植物和微生物能从外界环境中浓缩金属。
mass noun
- a substance made by removing water or other diluting agent; a concentrated form of something, especially food浓缩物（尤指食物）; 浓缩液：
apple juice concentrate.
浓缩苹果汁。
派生词
concentrative
adjectiveconcentrator
noun词源
mid 17th cent. （in the sense 'bring towards a centre'）： Latinized form of CONCENTRE, or from French concentrer 'to concentrate'. Sense 1 dates from the early 20th cent.