According to national statistics, coal mines with coal dust explosion risks account for 60% of all coal mines, among which coal mines with explosionindex over 45% accounting for 16.3%.
Only one explosion in recent history has made it to 7 on the Volcanic Explosivity Index – 10 times bigger than Krakatoa.
在近代历史上只有一次火山爆发达到了7级的火山爆发强度指数，它的爆炸力是喀拉喀托火山爆发的10倍。
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If you wish to compose an E-mail, index a database of web pages, stream a kitten video in 720p or render an explosion at 60 frames per second, you must first build a computer.