at the rate of =at the speed of

at the rate of =at the speed of at a speed of和 at a rate of有区别吗 冠词能用the吗 Speed is the rate of change of travel at half the speed of light Speed is the rate ofchange of at the speed of 和at a speed of的不同 at any rate in the narrow sense of the world at the speed of和with the speed of的不同 1“ at the sampling rate of 50MSample/s ” Working at the speed of life求中文翻译! the rate of change of f(x) is least at x=? 对at the speed of提问,应用What's the speed of还是How fast ,区别是什么?