To make an airplane contrail, you need water and some kind of microscopic particle for the water to condense around.
创造一条飞机的轨迹，你需要一些水和一种能让水在它周围压缩和微小粒子。
To make an airplane contrail, you need water and some kind of microscopic particle for the water to condense around.
创造一条飞机的轨迹，你需要一些水和一种能让水在它周围压缩和微小粒子。
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