A woman goes to see a doctor.He is a new doctor, and he doesn't know her, so he asks some questions.One of them is“how old are you?”
“Well,”she answers,“I don't remember, doctor.”She thinks(想)for a minute, then says,“I remember(记得)now.When(当……时候)I was eighteen years old, my husband(丈夫)was thirty.Now my husband is sixty.I know, that is twice(两倍)thirty.So I am twice eighteen.Now I am thirty-six.”