Of, belonging to, or designating the cultural period beginning with the earliest chipped stone tools, about 750,000 years ago, until the beginning of the Mesolithic Age, about 15,000 years ago.是什么意思_Of, belonging to, or designating the cultural period beginning with the earliest chipped stone tools, about 750,000 years ago, until the beginning of the Mesolithic Age, about 15,000 years ago.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句