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学习 Bootstrap 3 »
Bootstrap 3 是 Bootstrap 最稳定的版本，并且团队仍然支持其关键错误修复和文档更改。
学习 Bootstrap 4 »
Bootstrap 4 是 Bootstrap 的一个较新版本；具有新的组件、更快的样式表和更好的响应性。但是，不支持 Internet Explorer 9 及以下版本。
学习 Bootstrap 5 »
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