英英释义：not familiar with a particular experience or activity.
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.
sentence
1. “一窍不通”
She is a stranger to our language.
2. 面对争议他已习以为常。
Sun Yuchen, a post-90 cryptocurrency entrepreneur, is no stranger to controversy.
3. 当我们想表示“司空见惯”“家常便饭”时，都可以用到 be no stranger to。
Until he made his mark as an actor, poverty was no stranger to him.
4. Mr Kabila, who has been in power for 18 years, is no stranger to dirty tricks.
5. 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）
6. Mr Corbyn is no stranger to challenges to his leadership: an attempt by MPs to remove him in 2016 only left him stronger.
practice
棘手的事他见多了。
He is no stranger to troubles.
参考翻译：He is no stranger to thorny issues.
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