Fire Damper Là Gì - Nghĩa Của Từ Damper

a device that stops a piano string from making a sound, that can be stopped from working by pressing a key or pedal:
A damper, made of soft felt, presses against each string and prevents it from vibrating until it is wanted.
a metal plate in a chimney that can be moved to control the flow of air and make the fire burn faster or more slowly:
The worker in the boiler room said he was just about to close the damper when the explosion took place.
 

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