Now I'm really fantastic at drawing this mechanical device, but you can imagine that dropping weight can cause a paddlewheel to turn.

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。

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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.

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。

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When he crossed a bridge over the Schuylkill, it was wreathed with laurels and evergreens, and a cherubic boy, aided by a mechanical device, lowered a laurel crown over his head.

华盛顿骑马通过斯库尔基尔河上的一座桥梁时，桥上缠满了月桂树枝和常绿树枝。 机械装置升起了一个天真可爱的男孩，然后男孩为华盛顿戴上了桂冠。

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