At its worst, the crisis affected nearly a third of world air travel.

VOA: special.2010.04.23

It is at its worst after retirement ... when you are no longer-- you've exhausted your human capital and you're living off of all the accumulated physical capital.

退休后，到达顶峰,当你不再-,你用尽了你的人力资本,只能以之前积累下来的,有形资本为生。

耶鲁公开课 - 金融市场课程节选

"The unemployment rate could,could, at its worst be over 10 percent before it starts to get better,"

VOA: standard.2009.04.02

And the World Cup is where the beautiful game appears at its best -- and sometimes its worst.

VOA: special.2010.06.09

This latest incident comes at a time when Afghanistan is witnessing its worst violence of the eight-year-long war following the ouster of the Taliban from power in 2001.

VOA: standard.2009.09.12