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; 长有方形镶齿尾翼的美洲燕，在崖壁、墙的泥上建巢 返回 cliff swallow