英语每日一句：他对保险业务一窍不通。

He doesn't know beans about the insurance business at all.

他对保险业务一窍不通。

语言点：bean本意是“豆子”，在俚语中引申为“很小的量”，所以not know beans about sth. 就表示“对某事一窍不通，不了解”