钢管口应先装上管螺母，以免穿线时损伤导线绝缘层。

At first, pipe bolts should be erected at the nozzle so as to prevent the insulation coat of the conductor from being damaged while wiring.

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对风机及电动机的电源电压、频率、功率，盘管规格，加湿器种类，空气过滤器形式及效率，配管口径及方向等有要求时请注明；

About the supply voltage, frequency, capacity factor of the fan and motor, specification of coil pipe, kinds of humidifier, form and efficiency of air filter, caliber and direction of pipe and etc.

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为满足泵管口的受力要求，提出了采用波纹管补偿器时应采取的措施。

Measures for adopting bellows expansion joint have been proposed to meet the requirement of allowable force in the inlet of pump pipeline.

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Or in many kinds of gas refrigerators where you push a gas through a nozzle close to room temperature, what you find is that the gas coming out on the other side under lower pressure is cooler than the gas that went through on the other side.

或者在很多种压缩气体式冰箱中,你让气体通过接近室温的管口,你会发现从压力低的一边,出来的气体比通过,另一边的气体更冷,真正的冰箱实际上通过。

麻省理工公开课 - 热力学与动力学课程节选