The remnant of a supernova, first seen from Earth more than a thousand years ago, hangs like a gumball in a composite image released by NASA in June.是什么意思_The remnant of a supernova, first seen from Earth more than a thousand years ago, hangs like a gumball in a composite image released by NASA in June.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句