实验材料:四个小纸杯、胶泥、厚纸板、胶条、一支带橡皮头的铅笔、颜料、毛笔、图钉、剪刀。实验步骤:1.用毛笔在一个纸杯的外面涂上颜色,然后晾干。2.剪下两条厚纸板,摆成十字形,把纸板交叉处粘起来。3.把杯口粘在纸板的每一端。注意杯口朝同一个方向。4.用图钉穿过纸板交叉的中心点,钉在铅笔后面的橡皮头上。 Experimental materials: four small cups, clay, cardboard, tape, a rubber head with a pencil, paint, brush, thumbtack, scissors. Experimental steps: 1. Use a brush to paint the outside of a paper cup, and then dry. 2. Cut two thick cardboard, put into a cross, stick the cardboard at the intersection. 3. Stick the cup to each end of the board. Note cup mouth toward the same direction. 4. Use a thumbtack to cross the center of the board and staple the eraser head behind the pencil.