an artificial cloud created by an aircraft; caused either by condensation due to the reduction in air pressure above the wing surface or by water vapor in the engine exhaust
例句
The plane crossed the Moon.The contrail dispersed. 在影像上看去，飞机穿过了月球。
Contrail Frequency over the United States from Surface Observations. 地面观测得到的美国飞行云发生的频率。
However, the intervening change of capital the contrail of the destiny. 然而，资本的介入改变了命运的轨迹。
When this hot water vapour mixes with the surrounding air, a cloud in the form of a contrail may appear. 当热的水汽遇上周围的空气便可能形成雾,以尾流形式出现。
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。
The chip space movement contrail is studied systematically, and its initial movement contra il model is acquired. 建立了切屑在形成过程中与障碍物（工件及刀具）表面的约束方程。
