材料和工具:气球、垫板、塑料饮料瓶、橡皮膏布、剪刀、锯条、锥子、砂纸、百得胶等。制作方法:先用锯条把塑料瓶上面的口锯下来,再用砂纸把它磨平。接着在垫板上画一个直径50毫米的圆,剪下来,再在圆心钻一个直径1～2毫米的小孔。然后用百得胶把塑料瓶口胶牢在圆垫板的中央。等胶 Materials and tools: balloons, pads, plastic bottles, plaster cloth, scissors, saw blades, awl, sandpaper, hundreds of plastic and so on. Production methods: first saw the top of the plastic bottle sawing down, and then sand it polished. Next, draw a circle with a diameter of 50 mm on the backing plate, cut it, and drill a hole of 1 to 2 mm in diameter at the center of the circle. Then use a hundred plastic glue plastic bottle jail in the center of the pad. Other plastic