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③hyphens（连字符）
CSS 属性 hyphens 告知浏览器在换行时如何使用连字符连接单词。
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The browser is free to automatically break words at appropriate hyphenation points, following whatever rules it chooses to use. Suggested line break opportunities, as covered in Suggesting line break opportunities, should be preferred over automatically selecting break points whenever possible.
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.hyphens {
font-family: Arial, "Microsoft Yahei", "PingFang", "Simhei", sans-serif;
hyphens: auto;
}