He was motionless, all but for one finger that moved up and down in front of his face as if he were marking time with it.

他一动也不动，除了一根手指在他的面前上下摆动,好像在用它标记时间。

耶鲁公开课 - 1945年后的美国小说课程节选

It has units of time, it represents the price of time, and it is something that fluctuates through time in interesting patterns.

这是一种时间的单位,代表着时间价值,利率以它特殊的模式,随着时间上下摆动

耶鲁公开课 - 金融市场课程节选