Step 3: Tape the straw lengthways to the rectangular piece of cardboard. Attach the balloon to the angled end of the straw. Tape the connection airtight.

• 步骤三：用胶带把吸管纵向黏在长方形硬纸板上，然后再用胶带把气球紧密封黏在吸管弯曲那端。