| 词汇 | off the top of your head |
| 释义 | off the top of your head idiom 凭既有知识；不假思索地 from the knowledge you have in your memory "What's the capital of Mauritania?" "I don't know off the top of my head, but I could go and look it up." “毛里塔尼亚的首都是哪里？”“我没法马上告诉你，但我可以去查一查。” |
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