It is mixed for about two hours with some common chemicals and then allowed to cool.

VOA: special.2011.07.25

Or suffer a heart attack and be on the operating table for some number of hours and then, thanks to cardiac surgery or what have you,be resuscitated.

或是心脏病发，在手术室里经历数小时，最终被心脏外科医生救回来。

耶鲁公开课 - 死亡课程节选

It is mixed for about 2 hours with some common chemicals and then allowed to cool.

VOA: special.2009.01.26

Some visit for just a few hours.

VOA: special.2009.01.07

But that figure could rise dramatically, as some 150 personnel are still unaccounted for nearly 48 hours after the quake.

VOA: standard.2010.01.14