【引用】

https://pbs.twimg.com/media/DYGc7RUWkAIpfuX?format=jpg&name=4096x4096

https://lh3.googleusercontent.com/proxy/LMNEW3U2S0JxI1ItdDzK5zuPkEvfcOKWHwU2pwFIOfe0A6p-J4M1zNn0PIb1E9cthBZW_-SnidkD0Q05nK8uX6y26fo

https://upload.wikimedia.org/wikipedia/commons/d/dc/4StrokeEngine_Ortho_3D_Small.gif

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https://i.makeagif.com/media/5-31-2016/s5UuGp.gif

https://www.youtube.com/watch?v=tjTFTQpmOng

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