When bad weather prevented navigators from seeing the sun,moon or stars, they had to use a method called "dead reckoning" to find the ship's position.

VOA: special.2009.12.23

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

Teacher Laura Peterson says they got their inspiration from a teaching method that originated in Germany in the 1960s.

VOA: standard.2010.06.25