1、element

成分;组成部分

The exchange of prisoners of war was one of the key elements of the UN's peace plan.

交换战俘是联合国和平计划的一个重要部分。

要素；基本部分

Fitness has now become an important element in our lives.

现在健康已经成为我们生活中的一个要素。

（社会或组织内部具有相同目标、信仰或习惯的）一群人，一组人，分子

criminal elements within the security forces.

安保部队中的犯罪分子

the hooligan element.

流氓团伙

2、concentrate

全神贯注;集中（心思）

It was up to him to concentrate on his studies and make something of himself.

是否能专心学习并取得一定成就要靠他自己。

Water companies should concentrate on reducing waste instead of building new reservoirs.

自来水公司应该集中精力减少水浪费，而不是修建新水库。

使集中;使汇集

Italy's industrial districts are concentrated in its north-central and north-eastern regions.

意大利的工业区集中在该国中北部和东北部地区。

Most development has been concentrated in and around cities.

土地开发主要集中在城市及周边地区。