看圖學英語:朋友成陌路
Strangers can become best friends just as easy as best friends can become strangers.
陌生人可以變成最好的朋友，就像最好的朋友也可以變成陌生人。
知識點：
stranger n.陌生人；外地人；新手
a stranger to
1. 陌生人：She is a stranger to us.我們不認識她。
2. 外行：He is no stranger to property.對於房地產他絕非外行。
3. 新到某地的人：She was not a stranger to this place, she was educated here.她不是初來此地,她是在這裏上的學。
4. 不習慣於某種感情、經歷、狀況、工作等：She is not a stranger to misfortune.她對不幸的經歷並不陌生。
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