...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)。
基于1个网页-相关网页
I was approximately half way down the road, where the park and ride is located, when I saw a huge aircraft about 200 ft in length emerge out of the clouds about 100 ft over the tree line.
我是大约在路上，那里的公园和乘坐的位置，当我看到一个大约200英尺长的巨大的飞机出现在约100英尺的树线从云层中一半。
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。
Do not want something unexpected happened, and a nest in my line of sight, this wanted to poke it out, because they just love nest built on my favorite lovely weeping willow tree.
不想，出乎意料的事发生了，一个鸟窝出现在我的视线里，本想把它捅掉的，因为它们的爱巢正好修建在我最喜欢的那可爱垂柳树上。
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