名词
中文翻译：集中
同义词：
['concentrate', 'concentration', 'concentrate on']
例句：
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1. Thescientist needs to increase the concentration of thesolution.
科学家需要提高溶液的浓度。
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2. Theoil is very concentrated in this region.
这个地区的石油非常浓密。
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3. Theteacher focused his attention onthe students' concentration during thetest.
老师在考试期间关注了学生们的注意力集中度。