Timpani or as it's sometimes called a kettledrum, and it was playing two different pitches, actually sort of playing this pitch and this pitch, the octave and then the fifth.

定音鼓,或者有时称作半球形铜鼓,它正演奏两个不同的音高,实际上在演奏这个音高和另外一个音高,八度音阶和这个五度

耶鲁公开课 - 聆听音乐课程节选

It's quite a well-known place, sometimes referred to as Hampstead Village

这是个相当出名的地方，有时会被称作汉普斯特德村，

演艺人居住的街区 - SpeakingMax英语口语达人

The Salk Vaccine is also called the Killed Polio Vaccine, and some people call it KPV, also sometimes called Inactivated Polio Vaccine, IPV, but this is the vaccine I just talked about produced by Salk.

索尔克氏疫苗也叫灭活脊髓灰质炎疫苗,有人将其简称为KPV 有时也被称作,失活脊髓灰质炎疫苗,简称IPV,这个疫苗由索尔克研发,刚才讲过他

耶鲁公开课 - 生物医学工程探索课程节选