1.derived from 来源于

Many English words are derived from Latin and Greek words.
许多英语词是从拉丁词和希腊词派生而来的。

2.struggle with 与……斗争

We still have to struggle with all kinds of difficulties.
我们仍得和各种各样的困难作斗争。

3.used to 曾经做某事

He's much fatter than he used to be.
他较以前胖多了。

4.take place 发生

A total solar eclipse is due to take place some time tomorrow.
明天某个时刻会发生日全食。

5.be able to do 能够

If my father did it, I should be able to do it too.
如果我父亲做到了，那么我也应该能做到。
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