The explosion characteristics of pure coal dust were studied.

实验研究了纯煤尘的爆炸特性。

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The explosion characteristics of pure coal dust and coal-methane mixtures were studied experimentally in this paper.

本文就此针对纯煤尘和煤尘-甲烷混合物的爆炸特性进行了实验研究。

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The virtuous are often said to be as "pure as the driven snow" while villains are frequently described as having hearts of coal or blackened souls.

正派，通常被喻为像雪一样洁白，而反派，则被说成是长着一颗黑心或心灵阴暗。

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" Responding to the run-up in WLT, Li said, "Walter has outperformed its peers because it has successfully transformed itself from a sub-prime lending and homebuilding and coal business to a pure play in high margin metallurgical coal business.

FORBES: Magazine Article

Meanwhile, other completely different approaches involve burning coal in pure oxygen (oxyfuel), or turning it into a mixture of carbon monoxide and hydrogen, which is then burned.

BBC: Whatever happened to carbon capture?

Two other techniques, called gasification and oxy-combustion, work by reacting coal with pure oxygen rather than air, and thus produce exhausts that require little treatment before burial.

ECONOMIST: Carbon capture and storage