They count down the final seconds to midnight as they watch a brightly lit ball slide down a pole on top of a tall building.

VOA: special.2009.12.28

All right. So let's bring down our middle slide here.

好，让我们在这接着写。

麻省理工公开课 - 化学原理课程节选

All right. So let's bring down our middle slide here.

好，让我们在这接着写。

麻省理工公开课 - 化学原理课程节选