Think of it like a jug of water: you can't keep emptying yourself out to look after children around you without filling yourself up again.
这就比如是一壶水：你自己都空空如也，拿什么去照顾孩子，非得把自己充满起来再说。
2
Filling and emptying containers and boxes, and stacking and knocking down multiple items such as cups, blocks and plastic rings forms part of your baby's learning about reach, grasp and release.
灌装、排空容器和盒及叠加和推倒多物品如杯、块和塑料环的组成部分达到你的宝宝学习、掌握和释放。
3
This is critical in order to be able to detect the weak product surface that is common in solids measurements, both during filling and emptying.