钻孔者，爆破工？表层采矿，采石和建筑。
Drillers and Blasters? Surface Mining, Quarrying and Construction.
他们受雇于采矿，采石和建筑公司，也受雇于钻孔和爆破承包商。
They are employed by mining, quarrying and construction companies and by drilling and blasting contractors.
为了遏制奥运期间的污染，官方关闭了北京的所有建筑工地、市内及周围的许多工厂和采石场，为期2个月。
To curb pollution during the games, the authorities have closed all construction sites in Beijing as well as dozens of factories and quarries in and around the city for two months.
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