“You don't know you have to sing Happy Birthday twice to get the germs off?”
你难道不知道,要唱两遍生日歌才能把细菌赶走吗?
把唱生日歌和除菌扯在一起,一本正经地胡说八道。
You don't know you have to ...?
用夸张的常识反问逗人时用;对不熟的人会显得没礼貌。
Didn't you know you have to ...? / You mean you don't know ...?
口语
don't know you 连读,twice 重读,句尾上扬。
You don't know you have to knock twice to be let in? 你难道不知道要敲两下才有人开门吗?
