speed barrier的用法和樣例：
例句
- The speed of light turns out to be nature's speed limit.
光速原來是自然界的速度極限。 - 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，任何運動的物體或信號的發射都存在自然的速度極限，這使我們了解的詞語的普通意思失去了意義。
