| 单词 | contrail |
| 释义 | contrail (once / 155518 pages) n The white, smoke-like water vapor that follows the path of an airplane is called a contrail. On a clear summer day, you might see several contrails criss-crossing the blue sky. The next time you see the elongated, cloud-like lines in the sky that linger long after the plane that made them has disappeared, you'll know to call them contrails. They're caused by condensing water vapor from an airplane's exhaust. The word dates from 1945, a shortened version of "condensation trail," and they're sometimes also called "vapor trails." WORD FAMILYcontrail: contrails USAGE EXAMPLESBelow, a high altitude observation plane traced a lazy “S” contrail to the south of the climbing missile. Washington Times(Dec 08, 2016) On my way out, I lingered beneath fresh contrails streaming across a brilliant blue sky. Washington Post(Nov 23, 2016) Environmentalists point out that this doesn't include the warming impact of contrails or other gases and aerosols. BBC(Aug 28, 2016) n 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 Syn|Hyper condensation trail cloud a visible mass of water or ice particles suspended at a considerable altitude |
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