important and also difficult points
important and also difficult points
重点也是难点
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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This is also a reason, trying to understand each word is difficult, and it is not necessary at all. You should catch the most important points.
这也是一个原因，想要理解每个单词是很困难的，而且是根本不必要的，应该抓住要点。
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