当火球冷却时，内部的气化物质压缩形成固态微粒云。
As the fireball cools, the vaporized materials in it condense to form a cloud of solid particles.
这辆卡车正载着25吨硝酸铵行驶在墨西哥境内一个炸药厂通往一个煤矿的路上，爆炸形成了一个巨大的火球，造成至少30人死亡。
It was travelling within Mexico, en route from an explosives plant to a mine, with a cargo of 25 tons of ammonium nitrate. The wreckage exploded in a giant fireball, killing more than 30 people.
这是我们生命起源的轨迹，开始，我们的星球只补过时一个混沌的火球，伴随它的产生的恒星太阳形成。
These are trace of our origins. At the beginning, our planet was no more than a chaos of fire formed in the wake of its star, the sun.
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