So,their reward for finding a scat is they get to play ball for two to three minutes and that keeps them good all day long."

VOA: standard.2010.02.22

You can see them in the sopranos and altos up there and they just sit there on that pitch--a long note: one, two, three, four.

你可以在高音与中音区看到他们,而且他们一直留在那个音高上,一个长音符,一,二,三,四

耶鲁公开课 - 聆听音乐课程节选

What's happened actually if we base it in the last 25 years since the early '80s We've just had two recessions and they've been very mild by historical standards and...two--now three long expansions in between.

实际上是什么情况呢,80年代初期以来，这25年当中,我们只经历过两次经济衰退,而且在历史上算是相对轻微的,其间则是两，三次长时间的经济增长。

斯坦福公开课 - 经济学课程节选

"It will not be long lasting. For two,three months .

VOA: standard.2009.05.10