速率保持不变，但速度矢量会发生变化。

The speed is not changing, but the velocity vector is changing.

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谈话测试能够反映出锻炼者的跑步速度、心跳速率，能感觉出锻炼强度是否过高。

Running speed, heart rate, and ratings of perceived exercise intensity were all well correlated with the talk test results.

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因此，我们可以用星星的自转速度及速率作为衡量它们年龄的计时器。

And so we can use the spin rate, the rotation rate of a star, as a clock to measure its age.

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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

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The angle is increasing at a steady rate, so we know it's going at a steady speed.

转过的角度以恒定速率增加,所以我们知道它以一个恒定的速度运动

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It's gaining speed at some rate a.

速度的增长速率为a

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