The seismicity in Yunnan region in the 20th century occupies a front place in Chinese mainland in extremely high frequency, strength and hazard rate.是什么意思_The seismicity in Yunnan region in the 20th century occupies a front place in Chinese mainland in extremely high frequency, strength and hazard rate.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句