N a visible trail left by an aircraft flying at high altitude or through supercold air, caused by the deposition of water vapour in the engine exhaust as minute ice crystals 飞机云 (Also called condensation trail, contrail)
The jet fighter let go a silver vapour trail and disappeared at once in the blue.
那架喷气战斗机放出了一条银白色的雾化尾行，随即消失在天空中了。
The vapour trail, which some said appeared to be coming from a missile moving vertically into the sky, was filmed by the news helicopter near Los Angeles, in southern California.
那道蒸汽轨迹是广播公司的直升飞机在离洛杉矶不远，加利福尼亚南部拍摄到的，有人说，那道轨迹似乎像来自于一个垂直飞向天空的导弹。
When a charged particle zips through the chamber, the vapour condenses into a trail of droplets showing the particle's path and, if the box is placed in a magnetic field, its electrical charge.
当一个带电粒子快速穿越云室时，水汽会凝结形成一串小液滴，这样便标识出了该粒子的路径；若将容器置于一个磁场中，还能知道粒子所带电荷的性质。
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