This clock operates off of pneumatics, and it has air cylinders that will extend it out.
这个钟是靠气压运转的,它里面的气缸可以让它伸出来。
I built a pneumatic air cylinder that'll lower a light down to give me the light I need.
我做了一个气动气缸,它可以降下灯,给我需要的光线。
air cylinder can mean:-
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