"My understanding is that, from 2005 to 2020, China can cut four giga-tons to four-point-five giga-tons of CO2 emissions - that is huge,".

VOA: standard.2009.11.27

My understanding about Lisa Kudrow is that she came from a Hollywood family.

关于Lisa，Kudrow我所了解的是,她来自于一个好莱坞家庭。

麻省理工公开课 - 化学原理课程节选