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.
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