例句：石油、天然气以及其他各种矿物质，人类为自己取得的这些成就而喜形于色，然而，谁能断言那些狼藉斑斑的矿坑不会是人类自掘的坟墓呢？——《敬畏自然》严春友
北京地区旧石器文化遗物丰富，自1990年开始在北京城区和郊区县开展旧石器调查和试掘以来，发现旧石器时代文化遗址或地点38处。
There are plenty of Paleolithic culture sites in Beijing area. Some archaeological researches have been done since 1990 and 38 sites have been discovered in the area up to now.
纯掘工种与纯采工种各工龄段的 工龄别尘肺患病率之间，自1970年入矿年代以后差异无显著性（P>0.05）。
There was no obvious difference in the cumulative incidence of pneumoconiosis by exposure time between pure digging and pure mining workers with the year of mine-entrance after 1970(P>0.05).
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