1. arrest vt.逮捕，拘捕; 止住
例句：Attempts are being made to arrest the spread of the disease.
现正设法遏止这种疾病的蔓延。

2. threaten vt. 危及; 恐吓; 预示（某事）; 预示凶兆
例句：It's a very cheap way to threaten an old lady like this.
这样威胁老太太太卑鄙了。

3. believe vt.相信; 信任; 以为
例句：Whom should we believe?
我们应该相信谁呢？

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