【单词社交网络】S2-5《国家地理：宇宙之旅》
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a string of gleaming pearls 一串闪亮的珍珠
supernova 超级新星
__________________________________________________________And so violent, it triggered a string of nuclear reactions forcing atoms together, creating new elements: gold, silver, platinum, blasting them out into space.
http://t1.g.hjfile.cn/listen/201302/201302031053498709077.mp3Look at this! It's like a string of gleaming pearls. It's a fireball expanding out from what must have been a massive explosion. A supernova, so bright that when light from the explosion reached Earth 20 years ago, it was visible to the naked eye.看！很像一串闪亮的珍珠。一个火球在强烈爆炸后向外扩张，一颗超新星。爆炸产生的光亮非常亮，20年前抵达地球那时用肉眼就可以看到。
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