In the 1970s, when they sent a spacecraft to space, they also sent two CDs. One side of the CD were pictures that explained how to play the sounds, 27. an introduction to the Earth. The other CD had music albums by some of the greatest artists, as well as old songs from cultures all over the world. The albums were named “The Sounds of the Earth.” Besides, they added many photos of humans. NASA hoped that these items would make a good impression and act as a greeting to any life forms 28. might find them one day.  alien 外星生物 human 人類 spacecraft 太空船 introduction 介紹 album 專輯 impression 印象 26.

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