成语：diamond in the rough

　　释义：
　　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”，或者说“潜力股”。　

　　例句：
　　My friends don't have a very high opinion of the house I bought. True, it's small and outdated. But the way I see it, its my diamond in the rough. Once I build an addition on to it, install new windows, doors and give it a fresh coat of faint, it'll be quite inviting.
　　我朋友都觉得我刚买的房子买亏了。这房子确实不大，而且装潢也过时了。但是我觉得这幢房子很有潜力。一旦我重新装修，安上新的窗户和门，重新粉刷，这房子肯定能焕然一新。

　　Samantha's coach has tried to convince anyone who will listen that he's discovered the next great tennis star. But nobody believes that she's a diamond in the rough. No matter how much she trains, they think it's doubtful that she'll ever become an exceptional player.
　　萨曼塔的教练试图让其他人相信他真地发现了未来的网球明星。但是没有人相信她是一支潜力股。不管她怎么训练，大家都怀疑她是否能成为一名出色的网球选手。