Do you know the purpose of hot air balloons? Travel Suitable for falling in love with your girlfriend? Hot air balloons are romantic and warm in your impression, but you are wrong. Hot air balloons represent exposure and death
Hot air balloons played an important role in World War I. It can be said that they indirectly harvested many people's lives. The role of hot air balloons is to detect the enemy situation and avoid vulnerable strongholds from being attacked by enemy aircraft.