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一位老师让孩子们设计一台“训狗机”。有的小朋友提出,用一种皮带传动机,让狗站在传动皮带上,反方向跑动。有的小朋友提出,在自行车后面拴一根摆动的骨头,人骑着车,让小狗在后面跟着跑。有的小朋友提出不挂骨头,吊一只皮球,或放一只猫来引诱小狗。所有这些都是促使狗运动的方法。如果狗追不上骨头,它可以不跑;如果狗在传动带上跑累了,它也可以跳下来。怎样想出一种更有效的训练狗的办法呢?
A teacher let the children design a dog training machine. Some children suggested using a belt conveyor that allowed the dog to stand on the drive belt and run in the opposite direction. Some children suggested that a swinging bone be tied behind the bicycle and people should ride the car and let the dog run behind. Some children put up a hung bones, hanging a ball, or put a cat to lure puppies. All of these are ways to motivate dogs. If the dog can not catch the bones, it can not run; if the dog runs tired on the belt, it can also jump down. How to come up with a more effective way to train a dog?