1.   She has learned to put up with the constant roar of trucks and cars whizzing by.

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

3.   McGwire did as the fans let out a constant roar, then began trotting toward second.

4.   They adjust to the continual glare of fluorescent lights, to the constant roar of the engines, to the roll of the deck beneath them.

5.   Previous property booms largely bypassed this part of Hong Kong because of the noise and pollution, although most residents said they had become used to the constant roar.

6.   Wang said the Milky Way center is in a constant roar of star formation and destruction.