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单词 be well up in/on something
释义 be well up in/on something be well up in/on something1  → be well up in/on something at up1(7) to know a lot about something2  → be well up in/on something at well1(14) to know a lot about a particular subjectbe well up in/on something  
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初中学习网英汉双解词典包含236457条英汉翻译词条，涵盖了常用英语单词及词组短语的翻译及用法，是英语学习的必备工具。

　

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更新时间：2025/9/18 4:05:00