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水球球是一个多孔喷泉，孩子们爱和水球球互动的方式是去堵住出水的小孔，或者整个身体扑上去。堵住他们所能覆盖的孔洞，触碰水的压力。Hedgehog Spray is a porous fountain. Childrens favorite ways to interact with the water hedgehog is to plug the holes with hands or with their whole bodies. Throught pluging, children can feel the pressure of water.
