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来源:雅诚德英语网
The radio telescope thus appeared, and it is considered one of the greatest inventions in the twentieth century.
电波望远镜就这样出现了,它被认为是二十世纪最伟大的发明之一。
The radio telescope thus appeared, and it is considered one of the greatest inventions in the twentieth century.
电波望远镜就这样出现了,它被认为是二十世纪最伟大的发明之一。