1. Having brownish acidic waters, a high concentration of humic matter, and a small plant population. Used of a lake or pond. 
   无滋养的带有棕色酸性物质的水域，腐殖物高度集中并有小型植物群的。用来描述湖泊或池塘
2. directed with intense concentration. 
   以高度的集中指向……。
3. Her powers of concentration. 
   他集中注意力的能力
4. maximum allowable concentration for toxicant 
   毒物最大容许浓度
5. The average concentration of sewage bacteria (E.coli) in the central harbour in 1997 was about 12 000/100ml, little better than diluted effluent from a sewage treatment plant. This is a health hazard to any one who comes into contact with it often. 
   一九九七年维多利亚港中部海水的含菌量(以大肠杆菌计)，平均约为每100毫升12000个，只较污水处理厂稀释后的污水稍好，对经常接触维港海水的人士构成健康危险。

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