But as very massive stars live fast and die young, their explosive demises eject material, likely forming the loops.

但是因为超大质量恒星死的早，它们的爆炸放射出一系列的物质，就像形成的圆环。

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According to the International Atomic Energy Agency, there have been at least 25 incidents of lost or stolen nuclear explosive material.

根据世界原子能机构提供的消息，爆炸性核燃料发生被盗或者丢失的事故至少有25次。

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Engineers are finding ways to use less explosive material.

工程师们正在想方设法去减少使用爆炸材料。

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News reports said Adair used about three hundred forty kilograms of nitroglycerine explosive material to pull the oxygen out of the fire.

VOA: special.2009.03.22

But the acquisition of radioactive material for a so-called 'dirty bomb,' which is radioactive material that is dispersed with a conventional explosive device, that is not that challenging.

VOA: standard.2009.05.01

In both cases, cars were loaded with large amounts of explosive material, according to Guler.

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Although both are made from petroleum jelly, only one of them has potentially explosive material.

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According to Air Force officials, the 20.5 foot-long MOP carries over 5, 300 pounds of explosive material.

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