看美剧学英语习语：Off the top of (one's ) head
Off the top of (one's ) head: If you say something off the top of your head, you say it without thinking about it much or without trying to check it or find out more facts about it(不假思索；随口而出).This idiom suggests one has not used the inside of one's head before making some statement.中文释义：Off the top of one's head字面意思是在头脑外，它表达的意思是”我就随口一说，我大概想了一下，从大体上来看“。表达一个人对某件事没有准确的信息，没有经过仔细考虑或精确计算，只是根据自己脑子里的大概记忆或猜测来发表意见。例句：It's okay if you don't know exactly. I just want a reasonable estimate. So, just OFF THE TOP OF YOUR HEAD, how much would it cost to lease a Mercedes 500SL? 另外，这个习惯用语产生于20世纪50年代，而且美国人比英国人用得更多。
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Not off the top of my head : 一时没想起来
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