【TOEFL核心词汇】No.17 星云
Hints：Jupiter
只听写例句。前面的单词不用听写。有一个“-”符号，注意专有名词大写http://t1.g.hjfile.cn/listen/201212/201212031203408582847.mp3Jupiter is the best-preserved sample of the early solar nebula, and with its satellites, might contain the most important clues about the origin of the Solar System.
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