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If something happens or passes unnoticed, it is not seen or noticed by anyone.
I tried to slip up the stairs unnoticed.
我试图神不知鬼不觉地溜上楼梯。
雅思英语词汇收录8785个雅思英语词条，基本涵盖了全部常用雅思英语词汇的翻译及释义，是英语学习的有利工具。