China could develop a first-generation reusable launch vehicle (RLV) within 15 years, according to the China Academy of Launch Vehicle Technology (CALT).是什么意思_China could develop a first-generation reusable launch vehicle (RLV) within 15 years, according to the China Academy of Launch Vehicle Technology (CALT).在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句