At the upper timberline the trees begin to become twisted and deformed.
在树带界线的上限区域，树木开始弯曲变形。
There is still no universally agreed-on explanation for why there should be such a dramatic cessation of tree growth at the upper timberline.
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 fir why there should be such a dramatic cessation of tree growth at the upper timberline.
目前还没有一个普遍认同的解释来说明为什么会在树带界线上出现树木停止生长这种戏剧化的现象。
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