如果想向文件增加一些隐藏的元数据，而不必修改文件内容，这就很有用了。

This can be useful if you want to add some hidden metadata to a file without altering the file's content.

youdao

由于Ant允许在一个文件中定义多个目标，您可以修改文件内容并将两个或多个文件合并到一个中。

Since Ant allows multiple targets to be defined in one file, you can modify the file content and combine two or more files into one.

youdao

可以通过结合使用计时器和HTTP实现提供轻量的服务，从而自动地提供文件内容，在修改文件内容时更新返回的数据。

You can combine this with the HTTP implementation to provide a lightweight service to serve up the contents of a file, updating the data returned as the file content is modified.

youdao