柯林斯詞典roundel /?ra?nd?l/ (roundels) 1. N-COUNT A roundel is a circular design, for example one painted on a military aircraft. 圓形設(shè)計(jì) 返回 roundel劍橋詞典a circular decoration , especially a coloured circle on a military aircraft that shows its nationality 圓形裝飾；（尤指戰(zhàn)鬭機(jī)上顯示國(guó)籍的）圓形標(biāo)記 返回 roundel