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Use hyphens to separate keywords.
使用连字符-分隔关键字。
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No leading or trailing hyphens are permitted.
不允许使用前端或后端连字符。
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The two parts are separated by two hyphens (" — ").
这俩部分通过两个连字号(“——”)分开。
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Don't use hyphens in the domain if you can help it.
如果可能,就不要在域名中使用连子符“-”。
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Substitute Spaces with hyphens or underscores (one or the other).
将空格替换为连字符或下划线(其中一种或另一种)。