of,belonging to,or designating the geologic time,rock series,and sedimentary deposits of the first epoch of the Tertiary Period,preceding the Eocene Epoch and characterized by the appearance of placental mammals是什么意思_of,belonging to,or designating the geologic time,rock series,and sedimentary deposits of the first epoch of the Tertiary Period,preceding the Eocene Epoch and characterized by the appearance of placental mammals在线翻译_英语_读音_用法_例句