21. cancel vt. ['kæns(ə)l] 取消，废除
例句：The match had to be cancelled due to the bad weather.
比赛因天气不好只得取消。
例句：I've lost my credit card, so I have to go to the bank to cancel it.
我的信用卡弄丢了,我得去银行申请作废。
22. variable a. ['veərɪəb(ə)l]易变的，可变的
例句：Prices are variable according to the rate of exchange.
物价会随汇率而变动。
例句：His mood is as variable as the weather.
他的情绪如天气般反覆无常。
23. prospect n. ['prɒspekt] 前景，前途;景象
例句：What do you think about the marketing prospect?
你觉得市场前景怎么样?
例句：The prospect from the balcony was breathtaking.
从阳台上看去景色美极了。
24. prosperity n. [prɒ'sperɪtɪ] 兴旺，繁荣
例句：The new government ushered in a period of prosperity.
新政府的成立带来了一个繁荣的时期。
例句：Prosperity destroys fools and endangers the wise.
繁荣兴旺既毁了蠢人，也使智者陷于险境。
25. aspect n. ['æspekt]方面;朝向;面貌
例句：This is only one aspect of the problem.
这只是问题的一个方面。
例句：The building has a southern aspect.
那座建筑是朝南的。
例句：His brother is a man with a serious aspect.
他的兄弟是一个外貌严肃的人。
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