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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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

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