The fly cannot break the light barrier.

苍蝇无法突破光速。

But the speed of light, the light barrier, that's a very different story.

但要说到“光障”，那可就是另外一回事了。

If the bus is really a rocket ship, traveling near the speed of light, and a fly flies inside the rocket ship, apparently breaking the light barrier, how's that possible?

如果巴士是一艘在以接近光速的速度行驶的火箭，那么苍蝇在火箭内的速度似乎非常慢，很显然突破了光速，这怎么可能呢？