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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To make rational use of industrial waste materials and reduce pollution, and to supply the substitute fuel for oil fired furnace, the writers have developed a new type liquid fuel Still Residue.
The reactor tank fired four prominent tailgate, when stirring the liquid in the vessel wall to block the change in liquid flow, play a spoiler role, to achieve better mixing effect.