THE PRELIMINARY STUDY OF THE ACTIVITY CHARACTERISTIC OF THE GROUP STRONG EARTHQUAKES IN CHINA MAINLAND AND ITS NEIGHBOURING AREA, SICHUAN AND YUNNAN是什么意思_THE PRELIMINARY STUDY OF THE ACTIVITY CHARACTERISTIC OF THE GROUP STRONG EARTHQUAKES IN CHINA MAINLAND AND ITS NEIGHBOURING AREA, SICHUAN AND YUNNAN在线翻译_英语_读音_用法_例句