to direct your attention or your efforts towards a particular activity, subject, or problem

Come on, concentrate! We don't have all day to do this. 快点儿，集中注意力！我们可没有一整天时间来干这事。

I can't concentrate on my work with all that noise. 那么吵，我没法集中精力。

I find running concentrates the mind (= helps me to think). 我发现跑步能使我集中心思。

I'm going to concentrate on my writing for a while. 我要专心写作一会儿。

The company is concentrating (its resources) on developing new products. 公司正在集中力量开发新产品。

to bring or come together in a large number or amount in one particular area

Most of the country's population is concentrated in the north. 该国的大多数人口都集中在北部。

In the dry season, the animals tend to concentrate in the areas where there is water. 在干旱的季节，动物常常聚集在有水的地区。

to make a liquid or substance stronger and reduce its size by removing water from it

a liquid from which some of the water has been removed

fruit-juice concentrate 浓缩果汁

an ore from which rock has been removed

a mineral concentrate 精矿