| 短语 | be an unknown quantity |
| 释义 | be an unknown quantity if someone or something is an unknown quantity, you do not know what their abilities are or how they are likely to behave未知的人（事物） |
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英语短语词组词典共收录525608条英汉双解短语词组词条，基本涵盖了全部常用短语词组的翻译及用法，是英语学习的有利工具。