"When I found a medieval abbey in France that said they had been baking for 1300 years, but had lost the last monk who knew how to bake bread, I volunteered to come over and bake some bread for them.

VOA: standard.2010.07.16

The council on educational technology in MIT has Been doing that for MIT with the help from a couple Of consultants who've actually volunteered their time.

麻省理工教育技术委员会,在一些顾问的帮助下做着这项工作,这些顾问自愿牺牲他们的时间参与其中。

麻省理工公开课 - 媒体、教育、市场课程节选