大尾巴:我有好多好多的玩具,我非常喜欢和它们玩,洗澡的时候我就把一些积木、玻璃球,还有我最喜欢的恐龙放在澡盆里,我发现那些积木总是漂在水面上,恐龙和玻璃球就沉下去了,大尾巴能告诉我是为什么吗?迪儿迪儿小朋友:放在澡盆里的玩具为什么会有的浮起来,有的沉下去呢?这是因为 Big tail: I have a lot of toys, I really like to play with them. When I take a shower, I put some bricks, glass balls, and my favorite dinosaur in the bath. I found that the building blocks always floated on the water On the dinosaurs and glass balls to sink, the big tail can tell me why? Di children Di children: Why do the toys in the bath floating up, and some sink? This is because