1.discover vt.发现; 碰见; 撞见; 获得知识
例句：She discovered that they'd escaped
她发现他们已经逃跑了。

2.infect vt.使受影响，感染; 传染，散布病毒
例句：A single mosquito can infect a large number of people.
一只蚊子就可以感染很多人。

3.expose vt.揭露，揭发; 使暴露
例句：Lowered sea levels exposed the shallow continental shelf beneath the Bering Sea
海平面下降使白令海底部的浅层大陆架暴露出来。

4.effective adj.有效的; 起作用的; 实际的
例句：The project looks at how we could be more effective in encouraging students to enter teacher training
该项目着眼于我们如何能够更加有效地鼓励学生参与教师培训。
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