The hatch opened smoothly and he put his head outside.

Greg turned the handle of room 206, the door opened smoothly.

"The angle between the knees and the chest should open smoothly," he said.

The door opened smoothly with the hiss of an air lock.

B1 The city's public school system - with 1,100 schools, 1.1 million students and 80,000 teachers, the nation's biggest - opened smoothly.

Now the door opened smoothly and silently at my command.

The door to room eight opened smoothly after he'd inserted the key card.

The line opened smoothly, and the guns were wheeled up into position.

But it opened smoothly, still oiled from the last time.