The influence of viscosity, wettability, agitating rate and time on "particle gaining rate" are analysed.

并分析讨论了粘度、润湿性、搅拌速度、搅拌时间对粒子收得率的影响。

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This is the starting speed, that's the rate at which it is gaining velocity, and that's how long it's been gaining it.

这是起始时的速度,这是速度的增长速率,这是加速的时间

耶鲁公开课 - 基础物理课程节选

It's gaining speed at some rate a.

速度的增长速率为a

耶鲁公开课 - 基础物理课程节选

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