The room trembled and became hazed over.

Again the tubes lighted and the room trembled with the surge of power.

Ky felt shaky, as if the room itself were trembling.

The room trembled again, a shudder, a spasm.

A third time the bell sounded mournfully, and the entire room trembled.

The room was trembling, a tiny vibration in all the walls and the rock below.

Before he could say more, the room trembled as the rumble of explosives came from deep below.

The room almost trembled with energy, and his first impression was of enormous power.

The room trembled again as Nijel tried to look down the spout.

The room trembled again, and Shanna stumbled toward the easy chair.