regulation establishing the top speed permitted on a given road
双语例句
用作名词 (n.)
The speed of light turns out to be nature's speed limit. 光速原来是自然界的速度极限。
You see, the existence of a natural speed limit for the motion of any object, or the sending of any signal, makes simultaneity in our ordinary sense of the word lose its meaning. 你看，任何运动的物体或信号的发射都存在自然的速度极限，这使我们了解的词语的普通意思失去了意义。
