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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Cloud-seeding is a technique to enhance rainfall by introducing particles - often silver iodide crystals - into cloud systems, to help condense water vapor into raindrops.

云的催化是指将催化剂颗粒打入云中使云中的水蒸汽凝聚成水滴，从而实现降雨的技术，催化剂颗粒通常为碘化银。

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Physicist Jerome Kasparian, of the University of Geneva, said: "the laser can run continuously, you can aim it well, and you don't disperse huge amounts of silver iodide in the atmosphere."

日内瓦大学的物理学家热罗姆·卡斯帕里安说：“激光能持续发射，可以很好地瞄准，这样我们就不需要向大气喷洒大量的碘化银了。”

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

VOA: special.2011.01.11

More recently, the U.S. government project Stormfury attempted for decades to lessen the force of hurricanes by seeding them with silver iodide.

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These pellets, usually made of silver iodide, salts or calcium chloride, are physically dropped via plane or shot into the air via rockets.

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These offices, set up over the past 15 years, deploy artillery, rocket-launchers and aeroplanes to seed clouds with chemicals (usually silver iodide) that encourage droplets to form and fall where needed, or prevent the formation of destructive hailstones.

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