An aircraft leaves contrails as it flies over Frankfurt
Photograph: Michael Probst/AP
Photo highlights of the day: Twins on the tube and Farc rebels | News | The Guardian
https://www.theguardian.com/news/gallery/2016/sep/26/photo-highlights-of-the-day-charlotte-at-night-and-farc-rebels
Contrail - Wikipedia, the free encyclopedia
飛機雲(英語:contrail),又名凝結尾
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