One of the important geological events is that the ancient Sanmen Lake and the eolian deposition of the Loess Plateau coexisted from 7.3Ma B.P.是什么意思_One of the important geological events is that the ancient Sanmen Lake and the eolian deposition of the Loess Plateau coexisted from 7.3Ma B.P.在线翻译_英语_读音_用法_例句