The Hubble telescope was launched into space by NASA on April 20,1990 at a cost of over a billion do
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The Hubble telescope was launched into space by NASA on April 20,1990 at a cost of over a billion dollars.
请问,at a cost of over a billion dollars.在这里充当什么成分?
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我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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