“Say there’s a real fire, and the alarm goes off, what happens to all the patients in surgery – do they wheel them out into the rain under a big umbrella and keep operating on them, or do the surgeons just make sure they’ve got a few fire extinguishers handy and keep going?”...
The cooling method is the most common way to put out a fire. Water is the best cooling material because it is low in cost and easy to get. Another method of extinguishing fire is by cutting off the oxygen. This is usually done by covering the fire with sand, steam or some other ...
听力原文: To extinguish different kinds of fires, several types of fire extinguishers have been invented. They must be ready for immediate use when fire breaks out. Most portable kinds operate for less than a minute, so they are useful only on small fires. The law requires ships, trains, ...