The results show that gravity tide factor in tidal variation has better reflection to earthquakes, and with good correspondent ratio.

结果表明，潮汐变化中的重力潮汐因子变化对地震的反映较好，其对应率较高。

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But the BBC south-east Asia correspondent says a big factor was the in-fighting in Vietnam between reformists and conservatives.

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"There's no doubt that Wembley's status as a multi-sport venue is a factor, " said BBC Sport correspondent Dan Roan.

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