He replaced a portion of a rabbit's upper arm joint with a biomaterial scaffold, providing a place for cells to grow.

VOA: standard.2010.08.11

The second part is after he's been conditioned and he's kind of freaked out with the white rabbit.

但在他形成了条件作用之后,他对小白兔也产生了恐惧。

耶鲁公开课 - 心理学导论课程节选

The problem is in the second part they're throwing the rabbit at him but now he's okay.

问题是，在第二段影片中,他们是把小白兔扔过去的,不过，现在他已经不害怕了。

耶鲁公开课 - 心理学导论课程节选