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lit. ripe as a melon that rolls from its vine (idiom); fig. to know fluently
to know sth inside out
to know sth by heart
江苏热线英汉汉英双解词典包含207361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。