Two main glacial epochs affected both areas during the last 100 million years of Precambrian times.在前寒武纪的最后1亿年中，两个主要的冰川时期对两个地区都产生了影响。Cubism , Abstractionism, and Pop art have all been epochs in the postrealistic era.立体派 ...

Two main glacial epochs affected both areas during the last 100 million years of Precambrian times.在前寒武纪的最后1亿年中，两个主要的冰川时期对两个地区都产生了影响。Great men, like great epochs, are explosive material in whom tremendous energy has been...