roundel

n circular identifying mark showing nationality, used on military aircraft of some countries 圆形标志（表示国别的符号, 用於某些国家的军用飞机上）.

roughcast, roughen, roughly, roughneck, roughness, roughshod, roulette, round, round and round, round brackets, round off, round robin, round trip, round up, round-eyed, round-shouldered, round-table, round-up, roundabout, rounded, rounders, Roundhead, roundish, roundly, roundness, roundsman, rouse, rousing, roustabout, rout, route, route march, routine, routinely, roux, rove, rover, roving commission, row, rowan,