| 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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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。