而在黑暗中，我打开手电筒，无论我站着不动，还是向前跑，或是向后跑，电筒

In the dark, I turn on the flashlight, no matter what I stand still, or run forward or backward run, the torch head image projection of the shadow of Yang tight with me. If the measured speed of the torch sun cast a shadow under these states, it must be a constant 300,000 km per second.

And in the dark, I turn on the flashlight, whether I stand still, run forward, or run backwards, and the image of the flashlight head projects the sun shadow that follows me. If you measure the speed at which the flashlight in these states is projected, it must also be a constant 300,000 km/s.

And in the dark, I turn on the flashlight, whether I stand still, or run forward, or run back, the shadow of the torch image is followed by me. If we measure the speed at which the flashlight casts sunlight and shadow in these States, it must be a constant 300000 kilometers per second.