研究二叠纪末一三叠纪初生物大绝灭事件具有重要作用；

The action must also have played an important role in the mass extinction during the Late Permian and early Triassic.

youdao

研究二叠纪末一三叠纪初生物大绝灭事件具有重要作用；

The action must also have played an important role in the mass extinction during the Late Permian and early Triassic.

youdao