It will wash away and so you got to pick the right materials in order to build a bridge.

它可能会被水冲走,之后人们就会选择更好的材料,以造出了更为坚固的桥

耶鲁公开课 - 生物医学工程探索课程节选

It gives the students an opportunity to do wash-away mover and self-assessment.

它为学生提供了一次,重新自我评估的机会。

麻省理工公开课 - 媒体、教育、市场课程节选