It is the biggest loss of species since the dinosaurs were wiped out 66 million years ago.

这是自6600万年前恐龙灭绝以来最大规模的物种灭绝。

Humans can slow the loss of species.

人类可以减缓物种的流失。

So the loss of species is inevitably concerning because often we don't know what those species are doing, we don't know what other species are depending on them.

所以物种的丧失是不可避免的，因为我们通常不知道这些物种的作用，也不知道它对于其它物种的生存有什么作用。