When local variables are defined, they have no value and are not initialized.
定义局部变量时，它们没有值，也没有初始化。
The Discussions object has already been initialized, and can not be reinitialized.
讨论对象已经初始化，并且不能重新初始化。
The Discussions object has already been initialized, and can not be reinitialized.
讨论对象已经初始化，并且不能重新初始化。
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