Navigation progressively improved, from inertial systems to a camera with a video link, but by 1973 the drone still missed about half its targets.是什么意思_Navigation progressively improved, from inertial systems to a camera with a video link, but by 1973 the drone still missed about half its targets.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句