“春去春又回”的格言更适用于少数事物而不是冰河时代。按照地球正常的公转和自转的节律,在最近100万年里,冰原不断扩大和海洋不断缩小的时代往 The motto of “spring to spring back” is more applicable to a few things than ice age. In accordance with the normal rhythms of revolution and rotation of the Earth, in the last one million years, the ice sheet has been expanding and the ocean has been shrinking.