Step 1: Connect the pipes together.

Step 2: Stamp the balloon into proper size.

Step 3: Stretch the tail of the balloon and wrap it around the two fingers holding the balloon.

Step 4: Pass the tail through the circle around the finger and tie a fast knot.

Step 5: Pick up the balloon drawbar and thread the knot through the plastic hole on one side of the tray.

Step 6: Stretch the balloon tail around the tray. It's done.

Precautions:

Although there are many kinds of vehicles, their structures are similar. This should be said to be the credit of standardization and the need of large-scale production line. With the development of society, the progress of science and technology and the change of demand, the appearance of railway vehicles has also begun to change, especially the passenger cars are no longer the same old faces.

Generally speaking, the basic structure of a vehicle consists of five parts: body, underframe, running gear, coupler buffer device and braking device. The car body is the part of the vehicle carrying goods or passengers, and it is also the basis for installing and connecting other parts of the vehicle. The bodies of early vehicles were mostly wooden structures, supplemented by steel plates and bow bars. Modern automobile body is mainly steel structure or light metal structure.