将最后的编辑时间更改为当前时间，以便让服务器知道它必须重新编译该文件。

To touch a file means to change the last edit time to the current time, so the server knows that it has to recompile that file.

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编辑时间：你可以更改文章相关的时间和日期。如果你要更改，确定你选中了编辑时间复选框。

You can change the time and date associated with the post. If you do this, make sure you have the Edit Timestamp checkbox checked.

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增加ETag为实体的验证提供了一个比使用“last - modified date(上次编辑时间)”更加灵活的机制。

(an "entity" is another word a "component" : images, scripts, stylesheets, etc.) ETags were added to provide a mechanism for validating entities that is more flexible than the last-modified date.

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