So what we're learning,so far, is that there isn't any set definition as to what sustainability means."

VOA: standard.2010.07.14

Another value for community learning we set up to have office hours, synchronized office hours, with the students and the professor.

学习社群的另一个价值,在于给学生和教授，制定办公时间，有规律的办公时间。

麻省理工公开课 - 媒体、教育、市场课程节选