blot [blɒt]

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vt.弄脏（用吸墨纸）吸干；n.污点，污渍

a small area of ink made by mistake

That new factory is a blot on the landscape. 那新建的工厂破坏了此地的景色。
The crime he committed is a blot on his record. 他犯的罪是他的履历中的一个污点。