Underwater bicycle' propels swimmers forward at superhuman speed
船只依靠螺旋桨推动前进，那么人类装上螺旋桨，不就能长距离游泳了吗？一家法国公司真的发明了这样的
装置，让你在水里踩螺旋桨，有点像水下自行车。
它固定在两腿之间，有两个踏板。你用力踩踏板，就会带动后面的螺旋桨，将你推动前进。
该公司表示，该装置配合水肺，可以让你在水中轻松长距离行进.它也可以逆向行进，只是倒车的话，你需要
把它放在脑袋前面，双手转动踏板，姿势就会有点古怪。
French company Seabike has developed a swimming device that uses your own leg power to accelerate you through the water at superhuman speeds. This crank-driven pusher prop looks a bit like an underwater unicycle… We’d love to take one for a spin!
I can’t say I’ve seen anything like this “underwater mobility device” before. The idea is simple enough; you extend the Seabike’s pole to the appropriate length, then strap it to your waist with a belt. Then you find the pedals with your feet, and start turning the crank, with the waist strap to push against.