red roundel 红色表示镜
signal roundel 信号光环
roundel clip 表示镜卡圈
colored roundel 有色表示镜
deflecting roundel 偏光镜 ; 折光镜
pearl roundel 联珠纹
Aircraft roundel 国籍标志
N-COUNT A roundel is a circular design, for example one painted on a military aircraft. 圆形设计
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