C40 I'm not surprised

"En!" Lan Xiaoliu nodded. "It's said that it's a type of aircraft based on the expansion of hot air. It's an excellent design!" In her mind, Zhou Pang, who came from a big city like New York City, was already used to hot air balloons. However, every winter, the hot air balloons that appeared in the sky made her excited for a long time, because to Zhou Pang