cliff swallow
柯林斯词典
1. N an American swallow, Petrochelidon pyrrhonota, that has a square-tipped tail and builds nests of mud on cliffs, walls, etc 崖燕; 长有方形镶齿尾翼的美洲燕，在崖壁、墙的泥上建巢
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1. N an American swallow, Petrochelidon pyrrhonota, that has a square-tipped tail and builds nests of mud on cliffs, walls, etc 崖燕; 长有方形镶齿尾翼的美洲燕，在崖壁、墙的泥上建巢