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2. prove vt.证明，证实
例句：Please prove your identity.
请证明你的身份。
3. insert vt.插入; 嵌入
例句：You should insert a comma between two sentences
你应该在两个句子之间加个逗号。
4. strengthen vt.加强，巩固; 勉励
例句：Criticism and self-criticism strengthen unity.
批评与自我批评能增进团结。
5. opponent n.对手; 敌手; 反对者
例句：He downed his opponent in the first round.
他在第一个回合中击倒对手。
6. 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。
7. flee vi.逃走，逃掉
例句：He was lucky to flee the burning hotel.
他很幸运逃出了失火的旅馆。
8. change vt.改变，变更; 交换
例句：People like to change things around to suit themselves.
人们喜欢改变周围的事物，使之适合自己。
