A: Do you remember that actor’s name?
(你記得那個演員的名字嗎?)
B: Not off the top of my head, but I can find out for you.如果只有off the top of one’s head,就是「馬上想到…」
(一時想不起來。不過我可以幫你查出來。)
He named a few good restaurants in the neighborhood off the top of his head.
(他馬上講了幾家他所能想到的附近好的餐廳。)
I mentioned some ideas off the top of my head.
(我提了幾個我馬上想到的點子。)