We think meteors that crashed into the moon or tails of passing comets may have introduced watermolecules.
我们认为,撞击月球的流星或经过的彗星尾巴可能会留下一些水分子。
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Instead of making a clean break, water evaporating from treetops tugs on the remaining watermolecules, with that tug extending from molecule to molecule all the way down to the roots.
Thus our bodies continuously exchange old substance for new, just like a spring which more or less maintains its form and movement, but in which the watermolecules are always different.