He was at Cal Tech as an aeronautical engineer, but then got in trouble in the 1950s because he had some communist links in his past.是什么意思_He was at Cal Tech as an aeronautical engineer, but then got in trouble in the 1950s because he had some communist links in his past.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句