1、strength

体力;力气;力量

She has always been encouraged to swim to build up the strength of her muscles.

一直有人鼓励她去游泳以强健体魄。

He threw it forward with all his strength.

他使尽全力把它扔向前方。

(面对困境的)信心，勇气

Something gave me the strength to overcome the difficulty.

有些事给了我克服困难的勇气。

His strength is an inspiration to me in my life.

他的自信是对我人生的一种鼓舞。

实力;影响力

America values its economic leadership, and the political and military strength that goes with it.

美国重视其经济领导地位以及随之产生的政治和军事实力。

The Alliance in its first show of strength drew a hundred thousand-strong crowd to a rally.

该联盟的第一次实力展示便吸引了 10 万余众参加集会。

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。