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。
The explanation is that each aspen while appearing to exist separately as a single tree, is in fact only the stem or shoot of a far larger organism.
对此的解释是，每一棵白杨，虽然看起来是独立存在的一棵树，但实际上只是一个巨型有机体的茎或芽。
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。
Well, the problem with this explanation is these healthy yellow cedars are generally much more resistant to insect infection than other tree species.
这个解释的问题在于黄杉相对于其他树种来说其实有更强的抵御害虫侵袭的能力。
Well, the problem with this explanation is these healthy yellow cedars are generally much more resistant to insect infection than other tree species.
这个解释的问题在于黄杉相对于其他树种来说其实有更强的抵御害虫侵袭的能力。
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