Until the teens, telephones were very expensive because they didn't have good amplification technology.

在20年代之前,电话还是奢侈品,因为它们还没有增强讯号技术

耶鲁公开课 - 金融市场课程节选

Dialysis - and this is a method to replace or augment the function of your kidneys, to remove waste products really from the blood, which is something the kidney does continuously.

透析技术,这种技术用来替代,或者增强肾脏功能,以去除血液中的各种废物,就像肾脏持续进行的那样

耶鲁公开课 - 生物医学工程探索课程节选