The machine is equipped with control panel box , security protection system and powerful suction motor fan.

我们为客户配置电电控箱、相关的安全保护器和大功率、高性能的排风机。

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While one of the crew was using the Russian-made toilet last week, the toilet motor fan stopped working after “it made a loud noise”, according to NASA.

据介绍，上周一名宇航员上厕所时，“马桶突然发出一声很大的声响”，厕所的风扇就不转了。

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For some the sound could make sleep harder, but for others, the steady beat of the ticking, or the quiet hum of an electric motor in a fan can be very peaceful.

有些东西发出的声音令你很难入睡，但有些东西是固定行走或敲打的，风扇有规律的转动的声音听起来很和平。

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There are many kinds of work. There's electrical work, take the motor, you plug it into the wall, electricity makes the fan go around, that's electrical work. There's magnetic work.

我们复习一下大一,学过的功的概念：,物体在力的作用下，运动了一段距离。

麻省理工公开课 - 热力学与动力学课程节选