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In order to know a foreign language thoroughly, four things are necessary.
为了完全掌握一门外语，有四点至关重要。
youdao
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This leads us to the next rule: Know your material thoroughly.
接着便引出了第二条法则：充分了解你的材料。
youdao
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This leads us to the next rule: Know your material thoroughly.
接着便引出了第二条法则：充分了解你的材料。
youdao