Radon, the radioactive gas given off from the decay of naturally occurring uranium in soil, has been noted by the EPA to be a major environmental cause of lung cancer.[5]The
氡，放射性气体，由泥土中自然出现的铀衰变中释放。EPA已经注意到它是肺癌的主要环境原因。
Radon is a gas that comes from the radioactive decay of radium in rocks.
氡是来自岩石中镭辐射衰变而产生的气体。
Radon is a gas that comes from the radioactive decay of radium in rocks.
氡是来自岩石中镭辐射衰变而产生的一种气体。
Hold the bottle; don't prop it up by itself. This can help prevent choking, extra gas, tooth decay, and provide bonding time.
握紧奶瓶，不要让它自己滴下来，这样能防止窒息，过多的气体，牙齿的腐蚀，而提供了亲子联系的时间。
Calculates the natural ventilation rate by the tracer gas decay method. Explores the definition of the indoor criterion of carbon monoxide concentration and the carbon monoxide emission from cars.
利用示踪气体法计算了地下停车库的自然通风量，并讨论了地下汽车库内一氧化碳允许浓度和小汽车一氧化碳排放量的确定。
On the basis of distribution of radioactive elements and geological background, the theory equation of radon exhalation rate is derived from the decay rule of radioactive elements and gas diffusion.
根据放射性元素分布规律、地质背景及放射性元素衰变等，建立了计算氡析出率的理论公式。
On the basis of distribution of radioactive elements and geological background, the theory equation of radon exhalation rate is derived from the decay rule of radioactive elements and gas diffusion.
根据放射性元素分布规律、地质背景及放射性元素衰变等，建立了计算氡析出率的理论公式。
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