被动的加热系统中没有用到机械装置。
现在我真的很沉迷机械装置,但是你可以想象重物掉落的时候会带动桨轮旋转。
Now I'm really fantastic at drawing this mechanical device, but you can imagine that dropping weight can cause a paddlewheel to turn.
另一个例子是“警报器”这个词,是我们很熟悉的一个机械装置,当警车、救护车或消防车靠近时,警报器会发出警报。
Another example is the word siren, familiar to us as the mechanical device that makes such an alarming sound when police cars, ambulances, or fire engines approach.
now I'm really fantastic at drawing this mechanical device, but you can imagine that dropping a weight can cause a paddle wheel to turn.
机械装置的时候,我真的很着迷,你可以想象,当重物掉落的时候会带动桨轮旋转。
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