But well before all that happened, another event triggered a different burst of evolutionary activity.

但是在恐龙灭绝之前，另一件事件引起了大规模的生物进化。

youdao

But well before all that happened, another event triggered a different burst of evolutionary activity.

但是在恐龙灭绝之前，另一件事件引起了大规模的生物进化。

youdao