粗略的计算显示，任何有价值的地震预测手段，其观测的地震前兆的准确率必须达到98%以上。
Rough estimates suggest that any useful quake forecast method demands precursors that will prove correct 98 per cent of the time.
结果表明灰色预测系统在地电前兆数据的处理中有着一定的应用价值。
These demonstrate that the Grey prediction system is available to the processing of the geoelectrical data.
结果表明灰色预测系统在地电前兆数据的处理中有着一定的应用价值。
These demonstrate that the Grey prediction system is available to the processing of the geoelectrical data.
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