E文积累_20080310_not know beans about sth.

He doesn't know beans about insurance business at all. 他对保险业务一窍不通。

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　名词bean，本意是“豆子”。在俚语中，引申为“很小的量”（A small amount）。因此，not know beans about sth.，作为一个固定搭配，就表示，对某事一窍不通，不了解。

I don't know beans about investing. 我一点也不懂投资理财。