将假定无环境限定符作为名称前缀的参数有全局作用域，并且指的是层次结构中的较高层(应用程序)。
A parameter whose name is not prefixed by a context qualifier would be assumed to have global scope and refer to the higher level in the hierarchy (Application).
如果没有模式或机制，提供了一个无锁的指令序列，电话是一个具有相同参数的外部程序可以在运行时确定。
If there is no pattern or mechanism to provide a lock free instruction sequence, a call is made to an external routine with the same parameters to be resolved at run time.
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