About 20 percent of all Marine families went extinct, as well as most mammal-like creatures, many large amphibians, and all non-dinosaur archosaurs.

约有20%的海生群落以及多数类似哺乳类的生物，很多大型的两栖动物，和所有的非恐龙的祖龙都灭绝了。

youdao

Until this disaster, mammal-like creatures known as therapsids were actually more numerous than the ancestors of the dinosaurs, known as archosaurs.

此次大灭绝之前，兽孔目爬行动物（一种类哺乳动物）的数目远远多于恐龙的祖先祖龙。

youdao

The findings could help to explain why the archosaurs — the ancestors of crocodilians, dinosaurs, and modern birds — emerged to dominate the world some 250 million years ago.

初龙是鳄鱼、恐龙类以及和现代鸟类的始祖。这次的发现有助于解释2.5亿年前初龙在世界范围内大规模存在的原因。

youdao