1. announce vt. 宣布; 述说; 声称
例句：Please announce to the children that there will be no school this afternoon.
请通知孩子们今天下午不上课。

2. explore vi.勘查， 探测， 勘探
例句：In this chapter, we explore how and why.
在本章中我们将探讨如何消除和为什么要消除它们。

3. explain vt.讲解，解释
例句：He made up a story to explain why he was absent.
他编造了一个故事为他的缺席辩解。

4. involve vt.包含; 使参与，牵涉
例句：Certainly he wasn't going to involve the other comrades.
他肯定不想带累别的同志。
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