1. strengthen vt.加强，巩固; 勉励
例句：You cannot strengthen the weak by weakening the strong.
削弱强者不能使弱者变得强壮。

2. involve vt.包含; 使参与，牵涉
例句：It would involve all Rome in a fearful strife.
这将使整个罗马卷入一场可怕的战争。

3. expand vt.扩张; 使…变大
例句：I want to expand the medical program and the recreation program.
我要扩充医药工作和康乐活动。

4. fear vt.害怕; 畏惧
例句：We fear no death, still less difficulties.
我们死都不怕，何况困难。

5. crisis n.危机; 危难时刻
例句：His handling of the crisis attested to his strength of character.
他对危机的处理证明了他性格坚强.
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