1. High concentrations of pollutants in the air can be harmful to human health.
空气中高浓度的污染物对人类健康有害。

2. The company is looking to increase its concentrations in the Asian market.
公司希望在亚洲市场增加集中度。

3. The concentrations of certain nutrients in this supplement are higher than recommended.
这种补充剂中某些营养素的浓度高于推荐值。

4. Researchers found high concentrations of mercury in the water samples collected from the river.
研究人员发现从河流中收集的水样中汞的浓度很高。

5. The concentrations of students in the science program are typically smaller than those in the arts program.
科学项目中学生的集中度通常比艺术项目中的学生小。

6. The doctor recommended a cream with higher concentrations of active ingredients for faster healing.
医生建议使用含有更高活性成分浓度的乳霜以加快愈合。