1. 这是个什么词？
词：curb
英英释义：to control or limit something in order to prevent it from having a harmful effect
例句：He is a nice guy, and it is just that he cannot curb his temper sometimes.
2. 为什么选这个词？
“curb”是及物动词，意思是“控制”、“限制”。这是一个出现频率极高的单词，几乎会出现在每一期《经济学人》中。可以用它来替换 control 和 limit。下面通过几个例子来掌握这个词。
他人很好，就是有时候不太会控制自己的脾气，可以说：
He is a nice guy, and it is just that he cannot curb his temper sometimes.
很多年前纽约市为了限制高峰期交通，提高了停车费，我们就可以说：
Many years ago New York City raised parking fees in order to curb rush-hour traffic.
北京为了控烟几年前出台了相关法律，不过一点用都没有，就可以说：
To curb smoking in public areas, Beijing rolled out a regulation against it a few years ago. Thanks to lack of enforcement, however, smokers still smoke in public, completely disregarding the rule and people around them.
《经济学人》一篇关于非洲恐怖主义的文章中就用到了 curb：
At the same time, they could work harder to curb corruption and human-rights abuses by their armies and police forces.
《经济学人》在另一篇关于 YouTube 监管的文章中也用到了 curb：
Governments meanwhile are taking direct action to curb content that they deem inappropriate.
《经济学人》在写移民问题时常常会用到 curb, 比如一篇关于魁北克政治的文章中就用到了：
Mr Legault, a former airline executive, campaigned to curb immigration, even though the province has a labour shortage, and to deny work permits to newcomers who fail tests of “Quebec values” and proficiency in French.
最近有一期《经济学人》Special report 写的是南非，其中多次用到了 curb, 比如这句：
It was then that Jacob Zuma began his nine-year reign as president, during which time the thuggish kleptocrat and his cronies ransacked state-owned enterprises (SOEs), plundered local and provincial governments, and ravaged the law-enforcement institutions set up to curb such looting.
3. 怎样学会使用这个词？
1）翻译下面的句子： 特朗普对移民很不友好，一上台就开始限制移民。
（参考翻译：Trump is extremely unfriendly towards immigration and started to curb it as soon as he became president. 或 Utterly unfriendly to immigration, Trump started to curb it as soon as he was elected president.）
2）结合自己的生活、学习、工作、兴趣等，想象在什么语境下会用到这个表达。先简要描述这个场景，再造句。
例子： China introduced onechild-per-couple policy in the past for curbing the largely increasing population.
场景：
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