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var title_98390='Re:20大罕见的迷人气象奇观(组图)';
var body_98390='10&nbsp;火积云<br><br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;这又是由于温度过高所形成的现象。在一块相对较小的区域内，高速上升的强烈热气流在其下方形成对流，对流反之形成厚密的积雨云。火积云多由火山爆发、森林大火、乃至原子弹爆炸（即蘑菇云）引发。&nbsp;<br><br><br><img SRC=http://www.elanso.com/U/D/Dad/adff44c5102fca279fce7559abf66fee/128540098021847500.jpg ><br>';
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