1. 这是个什么词？
词：stranger
英英释义：not familiar with a particular experience or activity
例句：She is a stranger to our language.
2. 体会这个词 （进阶篇）
我们都很熟悉 stranger 是“陌生人”的意思，今天我们学习它的一个简单实用的用法：be a stranger to something，意思是“对某事不了解”，它的否定形式 be no stranger to something 也很高频实用，我们通过几个例子掌握 stranger 的这个用法。
说到“一窍不通”，我们能想到“know nothing about”，其实也可以用 stranger，比如她对我们的语言一窍不通：
She is a stranger to our language.
说到“熟悉”我们一下能想到 familiar，很多时候其实也可以用 stranger 替换。比如 90 后币圈创业者孙宇晨长期以来都处于风口浪尖，面对争议他已习以为常。我们就可以说：
Sun Yuchen, a post-90 cryptocurrency entrepreneur, is no stranger to controversy.
当我们想表示“司空见惯”“家常便饭”时，都可以用到 be no stranger to。比如一位演员在成名之前生活贫寒，就可以说：
Until he made his mark as an actor, poverty was no stranger to him.
再读几个《经济学人》中用到 be no stranger to 的句子：
1） Mr Kabila, who has been in power for 18 years, is no stranger to dirty tricks.
2） The province of North Kivu is no stranger to misery—it has long been home to some 120 militia groups that regularly rape and terrorise.（这句话中也出现了我们学过的 be home to）
3）Mr Corbyn is no stranger to challenges to his leadership: an attempt by MPs to remove him in 2016 only left him stronger.
3. 从认识到会用（作业）
1）翻译下面的句子：
棘手的事他见多了。
Tricky business is no stranger to him.
造句
Being abroad for the first time, everything seems to be a stranger to him.
（参考翻译：He is no stranger to thorny issues.）
