Aircraft roundel国籍标志
red roundel红色表示镜
colored roundel有色表示镜
signal roundel信号光环;翻译
spreadlight roundel偏光镜
deflecting roundel折光镜;偏光镜
roundel clip表示镜卡圈
pearl roundel联珠纹
color roundel spectacle色玻璃框
N-COUNT（可数名词） A roundel is a circular design, for example one painted on a military aircraft. 圆形设计