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