More recently, NASA abandoned hope for the X-33, a pro posed replacement for the space shuttle that was supposed to fly from the ground to orbit in a single stage, rather than using a booster rock et, because the technology never quite panned out.是什么意思_More recently, NASA abandoned hope for the X-33, a pro posed replacement for the space shuttle that was supposed to fly from the ground to orbit in a single stage, rather than using a booster rock et, because the technology never quite panned out.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句