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瑞典和英国的一些科学家最近一段时间一直对氡气放射进入到建筑在花岗岩和花岗质土石层上的房屋表示非常关注.美国地质学家最近对此也发出了警告.
Some scientists in Sweden and the United Kingdom have been very concerned about the radiation of radon gas into houses built on granite and granitic soil recently. American geologists have also issued a warning recently.