And then there's Herpetogaster, which … I'm not going to describe using my words We even had our own little cousin twitching around in those days -- a little, worm-like swimmer that scientists know as Pikaia.

然后是 Herpetogaster， 它… … 我不想用我的话来描述 那些日子我们甚至有自己的小表弟在抽搐——一种像蠕虫一样的小游泳者，科学家们称之为 Pikaia。