walk() walks through a directory, applying the style sheet.
walk()遍历目录，应用样式表。
While the other one use post-style to walk through all children of the tree.
而另一人使用后风格的遍历树的所有儿童。
Which style background music do you like when you walk in a shop ?
当你走进商店时，最喜欢听到什么样的背静音乐？
Then walk out the door in perfect style.
然后很有型的走出门口。
Then walk out the door in perfect style.
然后很有型的走出门口。
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