But I didn't ask for a family tree.

但我没有规定必须要画族谱。

麻省理工公开课 - 媒体、教育、市场课程节选

They designed and created this timeline and then shared with the children based on a timeline and the family tree that the professor had in his story.

全是由他们自己设计并制作的,并与大家分享,这样的家谱就像教授在,他的故事中给出的那样。

麻省理工公开课 - 媒体、教育、市场课程节选