4周搞定2000+托福核心词
先于寒武纪→前寒武纪
Precambrian
常考释义
adj. 前寒武纪的；参见：Archaeozoic;Proterozoic【地质】
My teachers had told me that the rocks were Precambrian and therefore should not contain fossils, so I told my father about it and he invited one of his friends to come and have a look.
我的老师告诉我这些岩石是前寒武纪的，因此不应该还含有化石，因此我告诉了我的父亲，他邀请他的一位朋友来帮忙看看。
n. the Precambrian：前寒武纪
The first three eons, which together lasted nearly 4 billion years, are together known as the Precambrian.
前三个时期合起来持续了40亿年，合称为前寒武纪（隐生宙）。
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