他们的主要作用是从外部获取数据，使用这些超级全局变量是安全的，因为他们不会被随意的使用。
These are mainly used to retrieve form data or other outside data, and there's no real harm in using these variables, since they should never be written to anyway.
全局组——由超级管理员或Group List Server管理员创建。
Global group-is created by a super administrator or group List Server administrator.
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