航迹云

A contrail is the visible vapor trail behind airplanes or rockets traveling at high altitudes.

这团痕迹可能是飞机或火箭飞上高空后留下的航迹云。

The width of the reservoir illustrated here is approximately 8 kilometers (5 miles); a jet flying over the reservoir left a contrail midway between the shorelines.

图片中显示出的水库宽度大约为8千米（5英里），一架从上方飞过的飞机在水库两岸之间留下了一条航迹云。

Field studies of contrails are rare, says David Travis of the University of Wisconsin-Whitewater. Most of our understanding of their effects is based on model studies.

对航迹云的现场研究一直是很稀少的。威斯康星大学白水分校的戴维·崔维斯说，我们所了解到的大部分对航迹云的研究都是基于模型研究的。

A study of one 1944 raid offers a rare opportunity to check our models of how contrails change temperatures.

对1944年那次突袭行动的研究提供了一个宝贵的检验我们之前建立的飞机航迹云影响天气模型正确与否的机会。