it is not easy to walk back and forth because of the high slope of the garbage mountain. After the two children find the garbage, they will carry on and down, and they cooperate to pass the garbage to Grandpa, which will save a lot of time.
Liu Yi he picked up a lot of bottles, because too many of the methods he had thought about were all used, holding in his hand, holding it in his arms, and taking into account the soft rubbish at his feet.