If you read one of the websites that I like to look at, Psycho Palisades, and palisades describe the strong fence that protect you from being torn down.

如果你到我喜欢去的一个网站去看看，叫做心理护栏，护栏形容的是那些强大的篱笆,保护你不被打倒。

麻省理工公开课 - 媒体、教育、市场课程节选

This process, I said, this ancient process of taking scabs from patients and introducing them to people you wanted to protect, was called variolation.

这个过程,我想,这个从病人身上取痂,接种到你想保护的人身上的古老过程,叫做天花接种

耶鲁公开课 - 生物医学工程探索课程节选