Contrails are clouds of ice particles formed around the small particles released from aircraft exhaust.
飞机划过天空时排出的尾气凝成小冰粒，它们周围逐渐聚集了更多冰粒，形成了凝结尾迹。
I don't think there will be good results - dry substances are not able to have any noticeable reaction with ice particles.
我认为不会产生什么好的效果，因为干物质无法与冰粒起任何明显的反应。
Also a plan of preparing ice particles continuously has been put forward, and the analyses and calculations are done in terms of theory.
同时提出一连续制备冰粒方案，并对其进行了理论分析及计算。
Snow crystals are ice particles that usually form around a piece of dust in the atmosphere. All snow crystals have six sides, but they form different shapes.
雪是由小冰粒围绕空气中的灰尘凝结而成的，雪晶有六个边，但他们有不同形状。
Snow crystals are ice particles that usually form around a piece of dust in the atmosphere. All snow crystals have six sides, but they form different shapes.
雪是由小冰粒围绕空气中的灰尘凝结而成的，雪晶有六个边，但他们有不同形状。
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