大约一万年前，冰河期终于全线撤退，从地球上消失。 从此，地球进入几十年到几个世纪的冬夏轮换时期，春夏秋冬，四季轮转，孜孜不息。 可见，气候本身就一直处在变化之中。

Reflecting this on a smaller scale, the 10,000 years or so since the glaciers last went into full-scale retreat have seen periods of relative cooling and warmth lasting from decades to centuries.

youdao