In astronomy, in optical astronomy, we cannot measure the period or the frequency of optical light.

在天文学中，在光学天文学中，我们不能测量周期或者可见光的频率。

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Electrons are vibrating, and they are vibrating with a certain frequency, and that means there is a certain period of one oscillation.

垫子在震动，它们以某一频率，进行震动，这意味着,存在某一震动周期。

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And another way 1 we can say period is just 1 over nu or 1 over the frequency So, now we know both the distance traveled and the time the elapsed.

周期，对的，它需要一个周期的时间，另一种说法是周期是，除以nu，也就是1除以频率，现在我们同时知道了。

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The time period and frequency are reciprocals.

周期和频率互为倒数

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The period, that's right. So, it's going to take one period to move that long. And another way 1 we can say period is just 1 over nu or 1 over the frequency So, now we know both the distance traveled and the time the elapsed.

还是？周期，对的,它需要一个周期的时间,另一种说法是周期是,除以nu，也就是1除以频率,现在我们同时知道了。

麻省理工公开课 - 化学原理课程节选

And he finds that the patents acquired in that time period tend to be of higher quality than the patents produced internally in the post-IPO period as measured by frequency of citation.

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Suppression has often been shown to increase the frequency of the unwanted thoughts you were trying to rid yourself of, once the period of active suppression is over.

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