This method USES deferred execution.
这个方法会使用延后的执行。
For example, topics like deferred execution are often misunderstood: looking at the implementation can clarify things pretty well.
比如说,像延迟执行一类的事,人们总是有很多误解:但是如果你看过代码的话,就能够很好的理清头绪了。
The main reason for doing this is that most of the collections you retrieve from an XML tree are yielded using deferred execution.
这么做的主要原因在于,从 XML 树检索的大多数集合都是用延迟执行生成的。
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