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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首先，我们已经改变了子树线。

First, we have changed the sub tree line.

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为了揭示高山树线随着气候变化而变化的现象，对长白山的高山树线变化趋势进行了研究。

In order to decipher phenomenon of tree line changing with climate variety, the trend of tree line on the Northern Slope of Changbai Mountain was studied.

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