The earthquakes occurred during radon content dropping.
地震发生在氡值下降的过程中。
Results of the experiment show that rock rupture may be considered as one of the causes of variation of Radon content before the occurrence of an earthquake.
实验结果表明，可以认为岩石破裂是引起地震之前氡含量异常的原因之一。
Radon gas in the air is present worldwide, its concentration depending on the highly variable uranium content of the soil.
在世界各地，空气中都存在氡气，其浓度取决于土壤中差别极大的铀含量。
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