The economy is not a mechanical device but a living organism.
经济不是一套机械装置，而是活的有机体。
The quick opening closure is a mechanical device which can open and close quickly.
快开盲板是一种能快速开启和关闭的机械装置。
A mechanical device for rotating the kelly.
旋转方钻杆的一种机械装置。
A mechanical device that cleans the windshield.
擦挡风玻璃的机械装置。
A mechanical device for changing the direction of drive.
是改变驱动方向的机械装置。
A mechanical device for changing the direction of drive.
是改变驱动方向的机械装置。
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