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。
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。
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。”
It was a compound called silver iodide.
那是一种叫做碘化银的化合物。
Unlike dry ice pellets, the particles of silver iodide do not evaporate when released.
与干冰粒不同，碘化银微粒在投放时并不蒸发。
When you disperse silver iodide into the sky, it is very hard to know whether it would have rained anyway, "Kasparian added."
而在天空中喷洒碘化银则很难判断其降雨效果。“卡斯帕·里安补充说。”
Shooting for rain, meteorologist Huang Binming (right) and his crew launch canisters of silver iodide into the sky near Madoi.
为了人工降雨，气象学家黄斌明(右)和他的小组在马多附近向着天空发射碘化银炮弹。
Experimental study indicates that silver iodide particles can promote the formation of snow crystals obviously and the growth rate of snow crystals is very low.
实验研究表明，碘化银微粒对雪晶的形成具有极好的促进作用，雪晶的生长是一个非常缓慢的过程。
Experimental study indicates that silver iodide particles can promote the formation of snow crystals obviously and the growth rate of snow crystals is very low.
实验研究表明，碘化银微粒对雪晶的形成具有极好的促进作用，雪晶的生长是一个非常缓慢的过程。
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