看美剧学英语习语：Diamond in the rough

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Diamond in the rough: A person or thing with exceptional qualities or characteristics that cannot be seen from the surface. A person who is kinder and more pleasant than they seem to be from their appearance and manner; A person who is wonderful despite a rough exterior; a person with great potential.
As in Jack is intelligent and trustworthy but lacks manners-he's a diamond in the rough.

中文释义：diamond in the rough：Diamond是钻石的意思，而rough, 意思是粗糙的，未经雕琢的。连起来，diamond in the rough, 字面意思是粗糙的钻石，实际上就是我们在中文里所说的“未经雕琢的璞玉”。这个习语的起源，最初人们用这个短语来指那些还没有经过雕琢的，特别是那些可能被打造成高贵珠宝的宝石。现在，我们用这个短语的引伸意义，来形容那些非常有潜力的人和物品。