It was early in the Archaean Era, 3.8 To 2.5 Billion years ago, that life first appeared on Earth.是什么意思_It was early in the Archaean Era, 3.8 To 2.5 Billion years ago, that life first appeared on Earth.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句