对于为什么树线以上的树木会突然停止生长，至今还没有一个公认的解释。

There is still no universally agreed-on explanation for why there should be such a dramatic cessation of tree growth at the upper timberline.

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这里60%以上的树木都是当地特有树种，其中许多属于珍稀树种。

More than 60% of the trees are endemic and many of them are considered rare.

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其实造纸业将消耗将近40%的工业用木头，17%的木头被用来制造打印纸和手写纸，这其中用到的原木甚至包含了一百年以上的树木。

The paper industry USES 40% of commercially produced wood, and 17% of the wood used to produce printing or writing paper comes from virgin forest that contains centuries - old trees.

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