One reversal was 2.6 million years ago marking the start of the Matayama epoch, a period that lasted until the magnetic field flipped again700, 000 years ago to begin the present Brunhes epoch.是什么意思_One reversal was 2.6 million years ago marking the start of the Matayama epoch, a period that lasted until the magnetic field flipped again700, 000 years ago to begin the present Brunhes epoch.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句