The sound of the engines dropped in volume and pitch as the machine accelerated.

These machines accelerate electrically charged particles, often electrons, to nearly the speed of light, then whip them around a huge, hollow metal ring.

The feral machine fell away into the sky, even as other machines accelerated toward the disturbance it had created.

The machine was accelerating again, although there was still no sense of motion.

He allowed the nose to rise to eight degrees nose-up and held it there as he trimmed and the machine accelerated.

The yellow machines accelerated, quickly overtaking them.

If these machines can accelerate, or help, someone to alter those patterns, that could be the relaxation mechanism.

The fact that the machines accelerated several trillion times faster than theory allowed was deemed slightly less embarrassing than having no theory at all.

The three machines accelerated, pursuing him.

These machines can accelerate from a standing start to 100 m.p.h. in fewer than three seconds, and decelerate, with huge carbon-fiber brakes, still faster.