wadi

noun
🔊/ˈwɒdi/
🔊/ˈwɑːdi/
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  1. (in the Middle East and North Africa) a valley or channel that is dry except when it rains(中东和北非仅在雨后才有水的)干谷,干河谷
    Word Originearly 17th cent.: from Arabic wādī.