因为土壤最终会因为风雨和松鼠爬来爬去的运动而从根部脱落，诸如此类。
As that soil is eventually shed from the roots by rain and wind and the movement of squirrels climbing around, things like that.
从树梢蒸发的水并没有彻底地分解，而是拉住了剩下的水分子，这种拉拽作用从一个分子延伸到另一个分子，一直拉到根部。
Instead of making a clean break, water evaporating from treetops tugs on the remaining water molecules, with that tug extending from molecule to molecule all the way down to the roots.
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