xml解析器是“智能化”的，它知道若开始了一个元素，此元素必然会在某处终止。

The XML parser is "smart" and knows that if an element is started, it must be finished somewhere.

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考虑一下只有自动化或者紧密控制的流程，才能给您带来可重复的代码；人类并不擅长记住启动或者终止计时器。

Consider that only automated or tightly controlled processes can give you repeatable metrics; humans aren't good at remembering to stop and start stopwatches.

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