正是羊膜动物进化出了蛋壳，这一进化使其可以在陆地上产卵，由此彻底切断与水的所有联系。
It was amniotes that evolved the eggshell, a development which let them sever all connection with the water by laying their eggs on land.
正是羊膜动物进化出了蛋壳，这一进化使其可以在陆地上产卵，由此彻底切断与水的所有联系。
It was amniotes that evolved the eggshell, a development which let them sever all connection with the water by laying their eggs on land.
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