Contrail, 凝結尾

A contrail is seen behind the SpaceX Falcon 9 rocket carrying a Dragon supply ship as it flies into space after lifting off from the launch pad on a resupply mission to the International Space Station in Cape Canaveral, Florida.
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September 21, 2014
http://www.voanews.com/media/photogallery/september-21-2014-day-in-photos/2457374.html
Contrail - Wikipedia, the free encyclopedia
http://en.wikipedia.org/wiki/Contrail
飛機雲 - 維基百科，自由的百科全書
飛機雲（英語：contrail），又名凝結尾
http://zh.wikipedia.org/wiki/%E9%A3%9B%E6%A9%9F%E9%9B%B2
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