1. explore vi.勘查， 探测
例句：Let us explore the meaning of this term.
让我们解释这个名词的意义。

2. detect vt.查明，发现; 洞察
例句：Attempts have failed to detect allantoicase.
试图检测尿囊素酶没有成功。

3. spend vt.用钱，花钱
例句：This is not the way to spend our fifth anniversary.
这不是我们过五周年纪念日的方式。

4. protection n.保护; 护照
例句：The lee of the rock gave them protection against the storm.
岩石的遮掩使他们得以免受暴风雨袭击。