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These films can be used to make a new type of loudspeaker that works by heating and cooling the air, rather than bouncing up and down to vibrate the air directly.

这样制成的薄膜可以被用来制造一种新型扩音器，这种扩音器通过加热和冷却空气工作，而不再是直接通过往复运动使空气产生振动效果。

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The main part of the cooling system is a 3-wheel air-cycle machine which works as a self-controlled system for heating and cooling.

冷却系统的主要部件是一部3轮空气循环机，是可以进行加热和制冷工作的自维持系统。

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This is similar to the way a power station's cooling tower works.

ECONOMIST: Combating climate change

To confirm that the device works by cooling the body, Dr Grahn himself volunteered to be the next test subject.

ECONOMIST: Athletics: Cool, man | The

These include central station alarms to alert police when a break-in is occurring, a plan to remove valuables to a nearby fine-art storage facility or a specially constructed safe room in one's home during a hurricane or tornado, and climate controls that ensure levels of heat, cooling and humidity appropriate to works of art.

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