Similarly, if an error occurs, the invoker of the procedure needs to decide whether to rollback the process to that point or not.
同样,如果发生错误,那么过程的调用者需要决定是否将过程回退。
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The point of a climate treaty, then, isn't so much to roll things back as to keep them from getting a whole lot worse—a worthy and important goal, if not a particularly inspiring one.