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I know that poem by heart．那首诗我能背。
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You must keep repeating the lines until they are known by heart．你必须反复练台词，直到把它们都背熟。
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let one know 通知某人，告知某人：
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If you want help, let me know．如果你需要帮助，可以告诉我。
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I’ll let you know in an hour or so．我将在一小时左右后通知你。
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get to know 逐渐认识（了解），（由不知道）变得知道：
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How did you get to know this？你怎么知道这件事的？
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I got to know them very well．我慢慢变得和他们很熟了。
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I really wanted to get to know America．我真想逐渐了解美国。
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538 knowledge
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knowledge主要表示“知识”、“认识”、“了解”（作不可数名词）：
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Knowledge is power．知识就是力量。
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A little knowledge is a dangerous thing．一知半解是危险的。（谚语）
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Her knowledge of zoology was limited．她对动物学的了解很有限。
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I have no knowledge of mathematics．我不懂数学。
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有时可加不定冠词：
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He has a wide knowledge of history．他有渊博的历史知识。
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She has a very good knowledge of English．她精通英语。
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He has a good knowledge of London．他很熟悉伦敦。
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有时表示“知道（某事）”：
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I have no knowledge of his whereabouts．我不知道他的行踪。
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He had some knowledge of how very ill she was．他稍微知道一些她病得多重。
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可构成一些短语：
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The case was common knowledge．这个案子是人所共知的事。
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The matter soon came to the knowledge of the minister．这件事部长很快就知道了。
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