Forgetting how to operate a familiar objectlike a microwave oven, or forgetting how to drive to the house of a friend you've visited many times before can also be signs of something going wrong.
A heavy object, like a football player moving at a high speed, has a lot of momentum—that is, once he is moving, it is hard to change his state of motion.
一个重物有很大的动量,也就是说,比如一位高速移动的足球运动员一旦运动起来,就很难改变运动状态。
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This would enable the hand, for example, to recognise an objectlike an egg and know how to pick it up without breaking it.