Earth must have gotten its water around the same time the eucrites did—which has big implications.

球应该和这个小行星群同一时期拥有水—这样的推理影响重大。

The scientists discovered that the chemical signature of water on Earth matches the signature of water in an ancient group of asteroids called eucrites.

家们发现球上水的化特征与一个名为钙长辉长陨石古老小行星群上水的化特征匹配。