来自《耶鲁大学开放课程：基础物理第13集第13集》

it means I didn't clap.

那也就是说我没有拍手
Two cars collide.

再比方说两辆车相撞了
So, if two things occur at the same time at the same place,

如果两个物体出现在同一时间同一地点
something happened that they met in space-time.

于是它们在时空里相遇
You cannot find another observer

没有其他的观察者
who says they did not meet in space-time,

会说它们没有相遇
or they'll say the two cars did not collide.

或者说两辆车没有相撞
Even after relativity,

即使有了相对论之后
it is true that two events at the same time and same place

在同一时间同一地点发生的两个事件
occur the same time and same place for all people.

在所有人看来也可以是同时同地发生的
Same time alone is not enough

只是同一时间是不够的
and same place alone is not enough.

只是同一地点也是不够的