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”
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”