Appearance white, more edges and corners, without powder product attached to quartz sand surface.

外观洁白，多棱角，无粉末积附于石英砂表面。

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Coal from the Powder River Basin of Montana and Wyoming tends to be low in sulfur, for example, allowing power plants to burn more without exceeding local pollution limits.

来自蒙大拿粉河盆地和怀俄明州的煤炭含硫量低，可保证发电厂不超出本地排污限制。

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The smelter, owned by Met-Mex Peñoles, part of a big Mexican mining group, ran without a roof from 1901 until 2000, blanketing the surrounding area with layers of fine black powder.

这家冶炼厂归Met-Mex Peñoles所有，它是一个大的墨西哥矿业集团的一部分，1901年建厂时它连厂房屋顶都没有，到2000年该厂把周围的地区盖上了一层层细的黑色粉末。

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C. and the Comptroller of the Currency still on the job, the central bank could take a powder without anybody noticing.

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Without saliva to moisten the powder, people invariably begin to gag and choke, followed by vigorous bouts of coughing.

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The challenge involves trying to swallow a tablespoon of cinnamon powder in under 60 seconds without drinking any liquid.

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