你有没有发现,一到秋天,仰望天空时,就能看见飞机拖出的细细的云,就像在天蓝色画布上,用蜡笔画出的一条一条的细线。你有没有过这种经验,天气很冷时,用嘴巴呵气,可以看到白色的雾气在眼前展开。其实,高空中的白色细线也是一样,飞机发动机排出的热气,进入低温环境,水气就会凝结,甚至结冰,成为条状的“凝结尾”。这些云气只有高空的飞机才制造得出来, Have you ever noticed that in the fall, when looking up to the sky, you can see the fine cloud that the plane dragged out like a thin line drawn in crayon on a canvas of sky blue. Have you ever had this experience, the weather is cold, breath with your mouth, you can see the white fog in front of us. In fact, the same is true of the white fine lines in the sky. The hot air discharged by the aircraft engines enters the low-temperature environment and the water and gas condense and even freeze to form a strip-like “condensation tail.” These clouds of gas are only made up of aircraft at high altitude,