Li Hua: Hey Larry, 你知不知道纽约附近哪个地方可以钓鱼呀?
Larry: Fishing, huh? I'm sorry Li Hua, I don't know jack about fishing.
Li Hua: 哎,我问你钓鱼的事,你怎么说你不认识Jack?
Larry: I'm not talking about a guy named Jack. When I say "I don't know jack about fishing", that means "I don't know anything about fishing".
Li Hua: 噢,原来jack在这里不是人的名字,你说 I don't know jack about fishing 意思就是“你对钓鱼一无所知”。这么说,jack在这里就表示 "nothing", right?
Larry: That's right.
Li Hua: I don't know jack about fishing, 那不就成了I don't know nothing about f[收起]