What is the instantaneous speed?
那何为瞬时速率呢？
The Internet is remarkable for the almost instantaneous speed at which it transmits information.
英特网对那几乎它传输数据的即时速度是显着的。
Thus, although instantaneous speed is a physical reality, there is difficulty computing it for lack of a precise definition.
这样，虽然瞬间速度物理真实存在，很困难去计算，因为缺乏精确定义。
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