tā / xià / lóu / shí / cǎi / kōng / le / yī / bù / jié / guǒ / bǎ / gū / guai / niǔ / shāng / le

他下楼时踩空了一步，结果把孤拐扭伤了。

He missed a step going downstairs and ended up spraining his ankle.