...结构，如图 2.5 所示，树 的根节点就是 PDF 文件的根对象，根节点下有四个子树： Pages tree (页面树)、 out line tree (书签树)、Articleth reads (线索树)、named Destination (名字树)。
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It had been planned that the tunnel would reach into a nearby forest, but the first man out emerged just short of the tree line.
原本计划是让隧道延伸至附近的一片森林中，但头一个爬出去的人却正好在树林边缘外现身。
Outside her shabby cottage, old Mrs. Tailor was hanging out laundry on a wire line, unaware that some children lay hidden in the leaves of a nearby tree watching her every move.
在她那破旧的小屋外，老泰勒夫人正在往一根绳上晾衣服，她根本没觉察到几个孩子正隐藏在附近的一棵树的树叶里，偷偷看着她的一举一动。
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