the ability to think carefully about something you are doing and nothing else

The noise outside made concentration difficult. 外面吵得我难以集中注意力。

There was a look of intense concentration on her face. 她脸上带着全神贯注的表情。

I find that yoga improves my powers of concentration. 我发现练瑜伽提高了我的注意力。

It was hard to follow what the teacher was saying, and eventually I lost concentration. 我发现自己难以理解老师在讲什么，最后就走神了。

The party's concentration on tax reduction has won them a lot of support. 政府集中推行减税政策，从而赢得了广泛的拥护。

a large number or amount of something in the same place

There is a heavy concentration of troops in the area. 该地区有重兵驻扎。

the exact amount of one particular substance that is found in another substance

a concentration of one part per million 百万分之一的浓度

High concentrations of toxic elements were found in the polluted areas. 在被污染地区发现了高浓度的有毒元素。

a card game in which players use their memory to try to find pairs of matching cards, turning over two cards at a time from a set of cards that are spread out face (= picture side) down