The id element is required by Atom and is a globally unique identifier (GUID) for this particular tweet.

id元素是Atom必需的，并且是这个特定的tweet的一个全局惟一的标识符(GUID)。

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A unique identifier, which can be as simple as the URI of a blog entry or other Web resource represented by an entry, or as complex as a truly unique 128-bit Globally unique identifier (GUID).

惟一的标识符，可以与blog记录或者用记录表示的其他Web资源的URI一样简单，也可以像真正的128位全球统一标识符(GUID)那样复杂。

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Second, an operating system entry is created that specifies the operating system image and references the RAMDISK device object (by its globally unique identifier, or GUID).

其次，操作系统项，将创建指定的操作系统映像和引用 RAMDISK 设备对象 （通过其全局唯一标识符或 GUID）。

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