precambrian

precambrian的英语例句

1. 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。

2. Gneiss, a metamorphic rock, can be commonly found in Precambrian areas.

   片麻岩, 变质岩, 可以发现,在常见的前寒武纪地区.

3. Precambrian time for as much as eighty - five percent of all geological time.

   从前寒 武 世纪以来地球地面大部分被冰川所覆盖的任何地质年代.