So if we wanna know the rate of change of neutrons as a function of time we will write this expression.

所以，当我们想要知道中子的变动率，那是时间方程，我们会写下这个表达式。

youdao

Remember angular velocity is just the rate of the change of the angle over time.

角速度,是角度随时间改变的快慢。

youdao

How else are you going to calculate how much your parts costs have gone up, or automatically give a limited-time discount to a valued customer, or calculate the effect of a retroactive rate change?

要不您如何计算零部件成本增长了多少，或者自动向有价值的客户提供限时折扣，或者计算追溯费用变更的影响？

youdao

As part of this year of celebration, we are taking the opportunity to look back at some of the huge changes that our sector has undergone during this time and more importantly as the rate of change accelerates what the future holds.

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In many of your metrics revenue, new users, time spent using your product the rate of change can be more important than the metric itself.

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"It's been a long time since we have had this rate of change -- it probably hasn't happened since the birth of personal computing 40 years ago, " he wrote.

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