CCTV9英语新闻：粉尘为什么会爆炸_在线英语听力室

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An initial investigation¹ has indicated that the explosion at Kunshan could have been caused by dense² clouds of dust that built up inside the workshop. But how does dust cause an explosion? Well, it's actually a well-known phenomenon. and the results can be devastating³.

What you’re seeing here is a demonstration⁴ of a dust explosion, 10 grams of flour are blown into a container with a flame inside. The fine flour particles suspended in air quickly combust, generating an explosion.

There are many materials commonly known to oxidize and generate dust explosions. They include coal, sawdust, and magnesium⁵ and even common household foodstuffs⁶, like grain, flour, sugar, and powdered milk. As that example shows, many of these materials are normally very safe, but when they float around in the air as fine particles, they change their nature completely

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1 investigation
n.调查，调查研究
参考例句：
In an investigation,a new fact became known, which told against him.在调查中新发现了一件对他不利的事实。 He drew the conclusion by building on his own investigation.他根据自己的调查研究作出结论。

2 dense
a.密集的，稠密的，浓密的；密度大的
参考例句：
The general ambushed his troops in the dense woods. 将军把部队埋伏在浓密的树林里。 The path was completely covered by the dense foliage. 小路被树叶厚厚地盖了一层。

3 devastating
adj.毁灭性的，令人震惊的，强有力的
参考例句：
It is the most devastating storm in 20 years.这是20年来破坏性最大的风暴。 Affairs do have a devastating effect on marriages.婚外情确实会对婚姻造成毁灭性的影响。

4 demonstration
n.表明，示范，论证，示威
参考例句：
His new book is a demonstration of his patriotism.他写的新书是他的爱国精神的证明。 He gave a demonstration of the new technique then and there.他当场表演了这种新的操作方法。

5 magnesium
n.镁
参考例句：
Magnesium is the nutrient element in plant growth.镁是植物生长的营养要素。 The water contains high amounts of magnesium.这水含有大量的镁。

6 foodstuffs
食物，食品( foodstuff的名词复数 )
参考例句：
Imports of foodstuffs accounted for a small proportion of total imports. 食物进口仅占总进口额的一小部份。 Many basic foodstuffs, such as bread and milk, are tax-free. 许多基本食物如牛奶和面包是免税的。

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CCTV9英语新闻：粉尘为什么会爆炸