Birch trees bend to the ground, every twig sheathed in silver ice. Frost forms exquisite patterns of lacy ferns on windowpanes.

白桦树向地面弯曲，因为它的每根枝条都被银色的冰包裹。在窗玻璃上，霜形成令人赏心悦目的带花边的羊齿植物图案。

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For decades, MayDay parades in Moscow have taken place under clear blue skies, aircraft having deposited dry ice, silver iodide and cement powder to disperse clouds.

几十年来，莫斯科的五月节游行都是在晴朗的蓝天下举行的，他们飞机上撒下干冰、碘化银和水泥粉来驱散云层。

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The chemicals fired into the sky, usually dry ice or silver iodide, are supposed to provide a surface for water vapour to form liquid rain.

发射上天的化学物通常是干冰或碘化银，它们应该能为水蒸汽提供一个表面以凝结成雨滴。

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Clouds with extremely cool water are mixed with man-made ice crystals, such as silver iodide and metaldehyde crystals.

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Instead of using aircraft-borne chemicals as seeds, the researchers propose spraying seawater from unmanned, wind-powered, satellite-controlled vessels that would cruise the latitudes where hurricanes form since droplets of brine have a similar effect to dry ice and silver iodide.

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In China, they use artillery shells, rockets and airplanes to spray existing cloud systems with silver iodide, a compound that triggers moisture in the clouds to form ice crystals, which then fall to earth as snow or rain.

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