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夜里妈妈常常要喂小宝宝几次牛奶,如果当场冲奶粉,则会太烫,小宝宝没法喝;如果事先冲好,则又冷了,很不方便!我想发明一种保温奶瓶,它的工作原理与
At night, my mother often feeds the baby a few times with milk. If the milk is on the spot, it will be too hot and the baby can not drink. If it is washed well in advance, it will be cold and inconvenient! I would like to invent a thermos bottle The working principle and