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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.
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«Решетнев» рассказал о сборке спутника «Ямал-501»14:53
想象一下，你用饼干模具在面团上按了一下，这就是 ExtrudeGeometry 做的事。，推荐阅读clash下载获取更多信息