Huronian冰河期的早期，也就是从24亿到23亿年前，似乎特别寒冷，整个地球第一次冰冻起来。
The early stages of the Huronian, from 2.4 to 2.3 billion years ago, seem to have been particularly severe, with the entire planet frozen over in the first "snowball Earth".
Huronian冰河期的早期，也就是从24亿到23亿年前，似乎特别寒冷，整个地球第一次冰冻起来。
The early stages of the Huronian, from 2.4 to 2.3 billion years ago, seem to have been particularly severe, with the entire planet frozen over in the first "snowball Earth".
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