Welcome to English in a Minute, where we teach you about idioms in American English.

欢迎收听《一分钟英语》，在这里我们教授大家一些美式英语中的俚语。

What would you think if you heard this: Off the top of my head.
当你听见“Off the top of my head（未经深思熟虑不能确定）”，你知道是什么意思么？
There is nothing on her head.
她头上可没有什么东西。
But let's see if we can find out what she means.
听听下面的对话，看看能否知道她在说什么。
Do you know Tom's email address?
你知道Tom的邮箱地址么？
I couldn't tell you off the top of my head, but I have it in my contacts list on my computer. Can I send it to you later?
但是现在我未经深思熟虑，不能确定（off the top of my head）。我电脑里有份通讯录。我能晚点发给你么？
Sure. That would be great. Thanks.
当然。这样太好了。谢谢。
"Off the top of my head" is a common phrase that means I am trying to remember something, and to give you a quick answer.
“Off the top of my head”是一个很常见的短语，意思是我努力回忆某件事，未经深思熟虑很快给你答复。
But if a person's memory is bad, sometimes the information off the top of someone's head is wrong.
但是如果某人的记性不好，有时候未经深思熟虑的信息是错的。
So it's best to confirm it.
所以做好是确认一下。
And that's English in a Minute.
以上就是本期的《一分钟英语》。