A spokesman for the group says CT scans are frequently used in hospital emergency rooms because the results can be read quicker than with other tests, like ultrasound or MRIs, that do not use radiation.

VOA: standard.2010.01.30

This is a signal - this passing of phosphorous - is a signal that's used very frequently in intracellular communication.

这是一种信号,一种通过磷酸来传递的信号,这种信号在细胞内通讯时经常被用到

耶鲁公开课 - 生物医学工程探索课程节选

This is a mode of communication that's used very frequently in the immune system as we'll see later.

这种通讯方式,在免疫系统中广泛使用,我们下面会讲

耶鲁公开课 - 生物医学工程探索课程节选

It used to be that people would hide money in their house and it would frequently get stolen and it didn't earn any interest.

过去人们往往是将钱藏在家里,经常被盗不说,还没有任何利息收入

耶鲁公开课 - 金融市场课程节选