外國笑話看不懂?"How was your date last night,Billy?" his friend ask

題目：

外國笑話看不懂?
"How was your date last night,Billy?" his friend asked.
"Fabulous.We went to the concert,had a bite to eat,and then we drove around for a while until I found a nice dark spot to park.I asked her for a kiss,she said that first I'd have to put the top down on the car.So I worked for an hour getting the top down ---"
"An hour?" interrupted his pal."I can put my top down in three minutes."
"I know," said Billy."But you have a convertible."

解答：

1L說得對,但是沒解釋清楚.
這裡的意思是Billy的朋友的車是帶可升降頂棚的敞篷車,但Billy的車就是普通的轎車.也就是說Billy根本沒有辦法把車子的頂棚降下來,只能拆下來.而Billy幹了一個小時,說明他確實是把車頂蓋拆了.