寻找适合进行人工干预的气象条件，然后喷洒化学药品，大约需要出动8至10架飞机。 大气中并非所有的水蒸汽都能转化为降雨，至于降雪，水蒸汽首先应该形成冰晶。
Not all water vapour in the atmosphere turns to precipitation, and for the snow to fall, water vapour should concentrate on ice crystals first.
他辞去了原先药品销售代表的工作来创办了一架喷气飞行器公司。
He quit his job as a pharmaceutical sales rep to launch his jet-pack company.
这位军官表示有两架直升机已在当天下午向映秀地区空投了食品、饮用水以及药品。
The military command said two helicopters airdrop ped food, drinking water and medicine to Yingxiu in the afternoon.
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