You have to keep speed in mind because all distance runs will be at a slower than race pace.

您必须时刻想着保持速度，因为所有的长跑都低于比赛配速。

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The control system functions to keep speed of the machines substantially constant and the voltage within prescribed limits, even the load may change.

控制系统的功能是在负载随时变化的工况下，确保机组转速恒定，并使电压输出控制在要求范围之内。

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You should always keep to the speed limit.

什么时候你都不得超过最高速度限制。

《牛津词典》

Remember, you've got to keep track of the sign of acceleration, so if you're picking up speed towards the ground, a is negative, so it will be g plus a, but a is a negative number.

记住,一定要注意加速度的符号,所以当你加速下降的时候,a 是负的,还是 g 加上 a,但是 a 是负数

耶鲁公开课 - 基础物理课程节选

So, for example, Washington will give the states federal highway funds, but only if they keep speed limits within a range Washington finds acceptable.

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"Motorists should keep their speed down, allow extra time for journeys and take extra care on the road, " a spokesman said.

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Perhaps most importantly, analysts said, the new architecture should allow AMD to keep boosting the clock speed of Duron to keep pace with -- or even stay ahead of -- Intel's Celeron.

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