跌下楼梯
Fall down the stairs
以上为机器翻译结果，长、整句建议使用 人工翻译 。
那小男孩头朝下跌下楼梯。
The little boy fell headlong down the flight of stairs.
《新英汉大辞典》
他跌下楼梯摔断了右腿。
He fell down the stairs and broke his right leg.
youdao
我认为大多数梦游者没有威胁且十分正常，但是存在一部分人由于跌下楼梯而受伤。
I think the majority of those that sleepwalk is fairly harmless and quite normal actually, but there are a proportion that do injure themselves falling down the stairs.
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