您可以使用该节点树查找根元素及其所有的后代元素、属性和兄弟元素的节点。

Using that tree of nodes, you could find the node for the root element, along with all of the root element's descendants, attributes, and siblings.

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最后，节点循环遍历所有的后代，并使用访问器调用它们的accept方法。

Finally, the node loops through its descendants and calls their accept method with the visitor.

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同样，如果一种植物或动物没有留下任何可以繁殖的后代，它就不能把所有的能量浪费在使自己变得更强壮上，因为这是最可能走向灭绝的方式。

Similarly, a plant or animal cannot squander all its energy on growing a big body if none would be left over for reproduction, for this is the surest way to extinction.

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