Most of the few U.S.airports that possess body scanning capability are using the technology for secondary screening of passengers who warrant closer examination by TSA officers.

VOA: standard.2009.12.30

For the adult learner, the technology has the capability of freeing us in terms of time and space.

对成年学习者而言，技术能够让我们免受,时间和空间的限制。

麻省理工公开课 - 媒体、教育、市场课程节选