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2. 电车下沉与小镇青年的“双向奔赴”从上述多位车友的描述中不难发现，他们不约而同选择开着电车回乡或出游的原因很简单，无非是成本更低、补能不再有焦虑，智能驾驶大大缓解了自己的驾驶疲劳。
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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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