You should always keep to the speed limit.
什么时候你都不得超过最高速度限制。
You've got to keep to the speed limit.
你必须遵守限速的规定。
A lot of people are in a rush, and it's very difficult to keep careful, for they would rather care for their speed than your safety.
很多人都在赶时间，很难保持小心谨慎，因为他们更关心自己的速度，而不是你的安全。
A So how do you keep your English up to speed?
A那么你是怎样使自己的英语不断进步的呢？
So we don't have to keep the speed constant.
不用保持速度恒定。
Your mind will keep up with your reading speed if you ask it to.
你的思路与阅读速度可以保持同步，如果你要求这样做的话。
To keep these customers satisfied, speed may not be of the essence.
要让这部分客户满意，速度也许不是最核心的问题。
He spoke too rapidly for us to keep up with the speed of his speaking.
他说的太快了，因此我们几乎跟不上他讲话的速度。
To keep the same speed, the swimmer had to shorten their stroke.
为保持速度，游泳者不得不较少划距。
Currently, China, on one hand, has to keep the high speed of economic growth, and on the other hand, should protect its fragile environment.
当前，中国一方面要保持经济的高速增长，另一方面要保护已经十分脆弱的环境。
Designed to: Keep your PC safe, error-free, and running at top speed.
保护系统安全，修复错误，以较高的速度运行。
You, currently, keep slipping from one extreme to the other at surprising speed.
而你，现在正从一个极端飞速地去向另一个极端。
It is favorable to entry service keep stable speed.
保持稳定的工作面推进速度有利于沿空巷道的维护。
Guideway inspection is very important to keep safe in the running of high speed train.
轨道梁检测是高速列车安全运行的重要保证。
It is necessary to keep the preload constant over the speed range of the spindle.
保存在纱锭的速度范围上的预载常数是必需的。
Edit: Something important you have to keep in mind to make your choice is speed.
编辑：重要的事情你必须记住，让你选择是速度。
Because of this speed it is difficult to keep the body in equilibrium.
因为以那种速度奔跑是很难保持身体平衡的。
Because of this speed it is difficult to keep the body in equilibrium.
因为以那种速度奔跑是很难保持身体平衡的。
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