The manual tutorial method of the institution is as follows: tools/raw materials, 1 plastic bottle, 1 balloon, 1 stick, 1 scissors, 1 thread, 1 flour (whether you want it or not),/kloc.

1. First, prepare all the materials. Cut the bottle in half first.

2. Take out the balloon again. Cut off a short piece of stick and put it away as shown.

3. Cut another line with a length of 10-25cm and get ready. (You can skip to step 8 directly) Tie one end of the thread to one end of the stick and fix it with transparent glue.

4. The same is true for the other end. Stick both ends of the balloon on the plastic bottle as shown in the figure.

5. Hang the newly made thread on the balloon as shown in the picture. Turn it over and hook the line with a stick.

6. You can skip this step and take out a long rope, one end of which is connected with a wooden stick, and the other end is connected with the remaining plastic bottles cut first.

7. At this time, you can also try to put the stick away, and you will definitely hear a bang. If you can't hear it, you can try to cut the line short and try again. Of course, if your balloon is big enough, you can put some flour on it, so that when others pass by, they will not only make a bang, but also spit out the flour inside.