The source was in captivity and could not move away.

The source of the danger that pursued him had just moved.

When a sound source is moving towards someone, the frequency seems to increase.

It means that the source of the return signal is moving.

Hybrid engines combine two different sources of power to move the vehicle.

That would mean the source is moving away from us at two percent of the speed of light.

Nevertheless people tap their great source of energy to move forward and life goes on.

But the source of that particular burbling moved through the dark wood beyond the clearing.

This source, according to the instruments, did not move at all.

The source of the power for which she searched had moved.