这确保了生成的标识符是惟一的，即使初始的业务事务失败。
This ensures that the generated identifiers are unique, even if an originating business transaction fails.
标识符是在赋值语句中进行定义和初始化的，并且可以在任何允许使用的地方使用。
An identifier is defined and initialized in an assignment and can be used anywhere a value is allowed. Listing 3 shows a sample grammar.
顺便说一下，初始化函数必须是文件中唯一未被声明为static 的全局标识符。
The init function, by the way, should be the only global identifier in the file that isn't declared static.
顺便说一下，初始化函数必须是文件中唯一未被声明为static 的全局标识符。
The init function, by the way, should be the only global identifier in the file that isn't declared static.
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