And if any of you were alert and coherent during the 1960s -- and we'd forgive you, if you weren't, OK -- you would remember this very famous picture taken by the Apollo 8 astronauts in 1968.
对于警觉思辨的人来说上世纪60年代 要不是那样的人也没关系 要是你还记得那令人难忘的 1968年阿波罗8号宇航员拍下的照片