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苏联、美国、日本及中国在地震危险区均进行氡值的测量。然而,在预测地震方面用这些观测确定的定量指标暂时尚未给出。
The Soviet Union, the United States, Japan and China measure radon levels in seismic risk areas. However, quantitative indicators determined by these observations in the prediction of earthquakes have yet to be given.