The rocks, found in a belt of ancient bedrock in Quebec, are estimated to be 4.28 billion years old.

这些岩石是在加拿大魁北克省的一个古岩床带发现的，据估计距今已有42.8亿年历史。

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The rocks, found in a belt of ancient bedrock in Quebec, are estimated to be 4.28 billion years old.

这些岩石是在加拿大魁北克省的一个古岩床带发现的，据估计距今已有42.8亿年历史。

youdao