如果就只是踢球跑步的游戏，那孩子们为什么大部分时间都站在原地不动呢？
If the idea is to kick the ball and run, why do kids spend most of their time standing still?
它有时间逃到安全的地方，否则它们也可以保持不动。
It has time to escape to safety, or else they can just remain motionless.
如果你能以光速运动，你的时间就会静止不动；如果你能以快于光速的速度运动，你的时间就会倒退。
If you could move at the speed of light, your time would stand still, if you could move faster than light, your time would move backward.
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