The moaning and the groaning had become a constant roar.

He could no longer tell if the constant roar came from the storm or from inside his head.

The only sound on Gehenna was the constant roar of the flames.

But it is the sound that makes the night strange, the almost constant roar no matter what is happening.

The air was hot, and the passage of steam through the massive pipes created a constant deep roar.

There is a constant roar, and a question of whether the hut will survive.

The roar, constant and low, was almost like the sea.

A constant low roar made it hard to hear what was going on above.

The restaurant maintained a constant roar of yelling and talking.

But as darkness fell I was subdued and a little frightened by the constant roar.