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.
另外就是拉链、扣子这种东西怎么系。有时候孩子很乐意自己穿脱，但是学习系扣子会有一些情绪崩溃的时候，比如系不上，系串了会显得急躁，有时候还会给自己急哭了。这都没关系，安抚情绪，鼓励她，然后手把手多教几遍，在让她每天练习就行。
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The sex scenes are lightly humorous, with Bateman and Cardellini fully committing to their characters' desires and their seeming belief that living out these dreams will fix their mid-life crises. (A particularly telling fantasy? Clark role-playing as a pool boy in his 20s.)