vapour trail
noun [ C ] UK (US vapor trail) uk/ˈveɪ.pə ˌtreɪl/ us/ˈveɪ.pɚ ˌtreɪl/
（飞机飞行时留下的）凝结尾迹，拉烟
water vapour that looks like a line of white smoke behind an aircraft as it flies
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