wài / céng / kōng / jiān / méi / yǒu / kōng / qì / yǔ / háng / yuán / bì / xū / chuān / tài / kōng / fú

外层空间没有空气，宇航员必须穿太空服。

There is no air in outer space, so astronauts must wear spacesuits.