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con.cen.tra.tionH.kBnt7s[n5treI7F[n, $.kB:nt-n集中，群集He strongly opposed the concentration (=existence of a large amount) of power in the hands of so few people. [U]他极力反对把权力集中在少数人手里。There is a (heavy) concentration (=gathering) of troops in the area. [C]这个地区聚集了很多军队。Concentrations (=Groups) of police became apparent as they drove further into the town. [C]当他们深入城里，一群群警察到处可见。(specialized) Concentration is the exact amount of one particular substance that is found in another substance.浓度a concentration of one part per million [C]浓度为百万分之一High concentrations of toxic elements were found in the polluted areas of the sea. [C]在这个海洋被污染的地区中发现了高浓度的有毒元素。A study is under way to determine the exact concentration of lead in the local water supply. [U]一个测定当地自来水中确切含铅量的调查正在进行当中。A concentration camp is a prison where people are kept in extremely bad conditions, esp. for political reasons.集中营During World War II, millions of Jews died in Nazi concentration camps.在第二次世界大战中，数以百万的犹太人在纳粹集中营里死去。
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