The sun had set, and the sky was rapidly cooling.

The mountain air had cooled rapidly with the setting of the sun.

The water was cooling rapidly in the wake of the storm.

The body is cooled rapidly, and its defense has to work overtime.

"I can't tell you that," she says, sitting up straight, her voice cooling rapidly.

It turned out to be a wall, cooling rapidly.

The sun was starting to set and the fall air was cooling rapidly.

Water was needed to cool rapidly flowing air and hot exhaust gases.

He turned purple very quickly, but just as rapidly cooled into blue, and finally breathed easily in white.

This process involves heating the metal and then rapidly cooling it in water.