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

2. extreme adj.极端的，过激的; 极限的
例句：The girls were afraid of snakes and picked their way along with extreme caution.
女孩子们害怕蛇，走路时格外小心。

3. expand vt.扩张; 使…变大; 详述
例句：Engineers noticed that the pipes were not expanding as expected
工程师注意到管道并没有如预期那样膨胀。

4. replace vt.代替; 替换
例句：The council tax replaces the poll tax next April.
市政税在明年4月将取代人头税。
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