glaciation is

冰川作用是

glaciations───n.[地质]冰川作用；冻结成冰

glaciation───n.[地质]冰川作用；冻结成冰

deglaciations───n.冰消；冰川的消失

glaciating───v.使冰冻，被冰覆盖，使受冰川作用

deglaciation───n.冰消；冰川的消失

digladiations───数字化

emaciation───n.消瘦，瘦弱；憔悴

glacialists───n.冰河学者

glaciates───v.使冰冻，被冰覆盖，使受冰川作用

The Quaternary glaciation started just a few million years ago – and is still going on.───第四纪始于几百万年以前，并延续到现在。

One theory is that the glaciation was triggered by the evolution of large cells, and possibly also multicellular organisms, that sank to the seabed after dying.───其中一个理论说，大细胞生物、很可能还有多细胞生物死后沉入海底所散发的气体导致了这个冰河期的出现。

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.───第一次冰期称为「休伦冰期」，因其遗迹在加拿大南部休伦湖北方的岩石中清晰可见。