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.
The Milano Cortina Winter Games ended on Sunday night as the Olympics always do: in light, spectacle and speeches about unity. In Verona, the Olympic flag passed to the French Alps and the twin flames were extinguished. But unofficially, at least, a flame also flickered 6,000 miles west.，更多细节参见51吃瓜
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