The United States, Russia now plans to walk in space, every time a certain task on their extravehicular activities of the technology has matured and have more practical purpose.是什么意思_The United States, Russia now plans to walk in space, every time a certain task on their extravehicular activities of the technology has matured and have more practical purpose.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句