劃破天際的飛機雲 Contrails: A Trail of Cloud Out of the Blue
APR. 16,2024 / Enjoy Editors 
Take a close look at these mysterious track in the sky
Think of what happens when you are outside on a very cold day. As you breathe in, the air becomes warm inside your body, and when you breathe out, you see a small cloud form. This is the key principle behind condensation trails, or contrails.
Contrails are left behind by airplanes passing in the sky. However, you may wonder why you see contrails on some days and not on others. As with your breath on a cold day, contrails only appear when planes are flying through cold, humid?air. The plane's engines create and release hot water vapor. When this water vapor hits the cold air at high altitudes, it becomes drops of water. If the temperature is low enough, it may freeze to form tiny ice crystals. These ice crystals are what make contrails visible.
深究天空中的神祕軌跡
回想一下，在寒冷的日子裡當你在戶外時會發生什麼事。當你吸氣時，空氣在你體內變得溫熱，當你吐氣時，你會看到一小朵雲形成。這是凝結尾（亦稱飛機雲）背後的關鍵原理。
凝結尾是飛機在空中飛過時的遺留之物。但是，你可能很好奇為什麼在某些日子裡看得到凝結尾，在其他日子裡卻看不到。正如同你在冷天中的呼吸一樣，只有當飛機行經又冷又潮溼的空氣時才會出現凝結尾。飛機的引擎產生並釋放熱水蒸氣。當這些水蒸氣在高海拔中遇到冷空氣，會變成水滴。如果溫度夠低，可能會結凍成微小的冰晶。這些冰晶是使人們看得見凝結尾的原因。 - mysterious a. 神祕的
- principle n. 原理
- leave behind... / leave... behind 留下...
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