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| NOUN |
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| /ˌkɒnsnˈtreɪʃn/ |
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| 1 | U the process of giving all your attention to something 集中精力；专心；专注 |
| It took all his concentration to stay awake. 他竭力使自己保持清醒。 |
| lose concentration She lost concentration for a moment and slipped. 她一不留神滑倒了。 |
| a lapse of concentration (=a short period when you do not concentrate) He had a little lapse of concentration and lost the game. 走神 |
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| 2 | C/U a large number of people or things in one area or a large amount of something in particular 聚集的人群（或物） |
| large concentrations of Christians in this part of the city 聚居在城市这一带的大批基督徒 |
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| 3 | C/U the amount of a substance that is present in something 含量；浓度 |
| An investigation found high concentrations of cancer-causing chemicals on the property. 一项调查发现该建筑含有大量致癌的化学成分。 |
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