The common set of metadata includes file name, author, created time, and updated time; however, in some cases, the common metadata is not sufficient to describe the file properties.

普通的元数据集包括文件名、作者、创建时间和更新时间；不过，对于某些情况，普通的元数据集不足以描述文件的属性。

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A deployable EAR file needs to be created and deployed in the target run time environment.

需要创建一个可部署的EAR文件，然后将其部署在目标运行时环境中。

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A helper file gets created for you every time you generate a controller.

在你每生成一个控制器(controller)的时候，helper文件也会相应为你创建出来。

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