On any given day odds are you'll see several contrails, some slowly spreading out to form high, cirrus clouds.

每天我们都有机会看到航迹云，有些会慢慢散开形成高卷云。

Social media video showed contrails from two Patriot missiles fired at the jet.

从社媒录像的飞行云可以看出，两枚爱国者导弹击落了战机。

Some contrails can form clouds that last for up to 18 hours.

有些凝结尾可以形成持续18小时不散的云。

But the contrails also stop heat coming up from the ground from escaping into space.

但凝结尾也阻止地面热量逃逸到太。

But what if the contrails that contribute the most to warming could be eliminated?

但如果对升温效应贡献最大的凝结尾可以被消除，那会怎样？

Contrails are made up of ice crystals that form when aircraft engines emit exhaust that hits the cold air.

凝结尾由冰晶组成，而冰晶则由飞机引擎排放的废气遇冷气凝结而成。

This process allows contrails to warm the planet about as much as the carbon dioxide emissions from aircraft.

这一过程使凝结尾对地球的加温程度与飞机排放的二氧化碳相等。

Think of it as a silver lining in those contrail clouds.

将其想象成飞机云的银线吧。

Such a change could be achieved if aircraft avoided flying in the thin layers of humidity where contrails form.

如果飞机避免在形成凝结尾的潮湿薄层飞行，这一改变就可以实现。

Sometimes, when scuba diving, I would look up from my clipboard and just see contrails of parrotfish poop raining down.

有时，在水肺潜水时，我会从写字板上抬起头， 只看到鹦嘴鱼粪便的尾迹如雨点般落下。

Since its introduction in 1969, the 747's  unique shape and quadruple contrails have become a familiar sight in the  skies.

自 1969 年推出以来，747 独特的外形和四条尾迹已成为天常见的景象。

This improved understanding of how to manage contrails presents an opportunity for the aviation industry to reduce its global environmental impact.

更好地理解凝结尾管理，为航业提供了减少全球环境影响的机会。