n.前寒武纪,前寒武层;
例句:
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2、
Precambrian time accounts for as much as eighty-five percent of all geological time.
前寒武纪占据了整个地质年代的百分之85.
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3、
The oldest rocks in the concession area belong to the Guyana and are of Precambrian age.
最古老的岩石层在圭亚那雨林,它们的年龄可以追述到前寒武纪.
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