Within the lungs, the mucus-lined bronchi split like the branches of a tree into tens of thousands of ever smaller tubes (bronchioles), which connect to tiny sacs called alveoli.

在肺部，布满粘液的支气管像树一样又分为成千上万个更小的管(细支气管)，他们连接到叫做肺泡的小囊。

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While drive letters split the file system into a series of different trees (one for each drive), Linux always has a single tree.

相比于使用盘符的文件系统，盘符将文件系统划分成一系列不同的树(一个盘符代表一个文件目录树)，而Linux系统只有一个文件目录树(并没有分割文件系统)。

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But researchers at the University of Exeter found a pregnant one hanging out in a split pine tree that had been planted as a windbreaker long ago.

但是埃克塞特大学的研究人员在一棵很久之前被作为挡风林种植的现已裂开的松树上，发现了一只悬挂着的怀孕长耳蝙蝠。

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But the researchers say the new fossil shows the Alvarezsauridae group split from birds much earlier on the evolutionary tree than was thought.

BBC: New dinosaur discovery solves evolutionary bird puzzle

"There are bits blowing off the tree and there is a large split up the middle, there's a lot more cultivation in the field now and the plough could have damaged the roots, " he said.

BBC: Man down! Rihanna tree is dying according to farmer