Precambrian的例句（Precambrian在句子中的用法）

• 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.
• Late Precambrian mafic dyke swarms are extensively developed in the central North China Craton. 华北克拉通中部广泛发育晚前寒武纪镁铁质岩墙群.
• 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.
• 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。