The most frequently used method is radiocarbon dating.

最常用的方法是放射性碳定年法。

《柯林斯英汉双解大词典》

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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 was also important to place frequently used letter keys centrally close to each other.

BBC: KALQ thumb-type keyboard takes on Qwerty

But our survey is aimed at homeowners, so the final ranking includes only tools that frequently used by amateurs.

FORBES: The Most Dangerous Power Tools

U.S. Department of Justice spokesman Dean Boyd said the statute had been "frequently used" by the department.

CNN: WMD: From A-bombs to pressure cookers