glaciation

glaciations were approximately synchronous in both hemispheres.

河作用在两半球大约是同时发生的。

It has unique evidence of glaciation during the Quaternary Period and is the birthplace of China's glaciological theory.

宋代理学大师朱熹在此提出的教育思想为中国古代教育的准则，在世界教育史上也有重要影响。

The first of these glacial periods is often called the Huronian glaciation because it is well exposed in rocks just north of Lake Huron in southern Canada.

第一次期称为「休伦期」，因在加拿大南部休伦湖北方的岩石中清晰可见。