The suggestion of speeding up the development of a large thrust LOX/LH2 engine and taking vigorous action to research advanced propulsion technology are proposed.是什么意思_The suggestion of speeding up the development of a large thrust LOX/LH2 engine and taking vigorous action to research advanced propulsion technology are proposed.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句