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And, if a robot arm were to swing out towards you, for safety reasons you would want to be able to immediately stop it and push it back without harming yourself, reverse that motion instantly. For one thing, that requires a back-driveable actuator.，详情可参考新收录的资料
，详情可参考新收录的资料
* @param {number[]} speed 每辆车的速度数组（英里/小时）
Notes and Text Editor。新收录的资料是该领域的重要参考