Douglas N.C.Lin, like many scientists of his generation, traces his passion for astronomy to the launch of Sputnik in 1957.是什么意思_Douglas N.C.Lin, like many scientists of his generation, traces his passion for astronomy to the launch of Sputnik in 1957.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句