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.
变化轨迹可分为电导 率随时间增加而增大的水型轨迹和随时间增加而减小的吡啶型轨迹两种类型。
On a large time scale, the variation trajectories can be divided into two groups. The one is that the conductivities increase with time increase, known as "water type trajectory";
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