contrail是什么意思

音标:英 ['kɒntreɪl]美 ['kɒnˌtreɪl]

凝(结尾)迹

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

contrail的用法和例句：

1. Been seeing those contrails for a while.

那凝结尾迹效果持续了好一会儿

2. The moisture in the air and the ship flying through it made the contrails, and a lot of times you wouldn't have them because it depends on the amount of moisture in the air.

飞机从云层穿行而过 就形成了尾迹云 大多数时候尾迹云是无法形成的 这取决于空气的湿度