一种全局符号定义，它不能被与定义该全局符号的模块相链接的其它模块直接引用。
The definition of a global symbol that is not explicitly available for reference by modules linked with the module in which the definition occurs.
注意只有全局导出的符号定义才是正式过程描述符。
Notice that the only symbol definition that is exported globally is the official procedure descriptor.
该成员（所包含）的定义：或者是全局的或者是一个弱符号。
The member's definition may be either a global or a weak symbol.
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