At the same time, four Tier-Three countries from last year were upgraded in recognition of their anti-trafficking efforts Algeria,Moldova,Oman and Qatar.

VOA: standard.2009.06.16

You can make multiple--you can put three or four-- the copy gets worse and worse each time, but you've got multiple copies.

你也可以复写多份，放上三四张复写纸-,不过越往下复印的效果会越差，但终归你还是有了多份副本。

耶鲁公开课 - 金融市场课程节选

"Now we have what we would call rush hour conditions or peak travel conditions for as much as eight hours during the day - about three to four hours in the morning and similar time in the evening."

VOA: standard.2010.07.26