strength,力量，-en,使。

1. His visit is intended to strengthen ties between the two countries.

他此次访问旨在增进两国间的关系。

2. He has a new fitness regime to strengthen his back.

他有一个增强背部力量的新健身计划。

3. In a strange way, his affair caused our relationship to strengthen.

奇怪的是，他的婚外恋倒使我们之间的关系更加紧密了。

4. I am also looking urgently at how we can strengthen the law.

我也在急切地关注我们该如何加强法制。

5. Yoga can be used to strengthen the immune system.

瑜伽能增强人体免疫系统。