词汇讲解：
1. allowance n. 零用钱
例句：Some children get a weekly allowance .
一些孩子每周能得到零用钱。
2. costly adj. 昂贵的，代价高的
例句：His costly mistake resulted in severe loss.
他的严重的错误导致了重大的损失。
3. timing n. 时机，时间的选择
例句：The timing of the meeting is not convenient.
会议的时间安排不合适。
4. budget n. 预算
例句：The work was finished on time and within budget
工作按时完成且未超出预算。
5. extra adj. 额外的，附加的
例句：Married officers get extra allowances.
已婚的军官有额外津贴。
6. invest v. 投资
例句：The best time to invest is now.
现在是投资的最佳时机。
7. sacrifice n. 牺牲
例句：Our father won’t approve of any sacrifice of studies to sports.
我们的父亲不赞成为运动而牺牲学业。
8. interest n. 兴趣，爱好
例句：He lost interest in much of his research.
他对大部分研究工作失去了兴趣。
n. 利息
例句：Interest is paid at the rate of 1% per annum at present.
目前每年的利率是1%。
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