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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When the cryogenic refrigerator works on this optimum cone Angle, the performance can be improved that means the decreasing of the lowest cooling temperature and the increasing of the cooling power.

在最佳锥度下，采用锥形脉管制冷机对改善制冷机的性能，进一步降低制冷温度、提高相同制冷温度下的制冷量是有利的。

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

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

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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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