Blue Peter
柯林斯词典
1. N a signal flag of blue with a white square at the centre, displayed by a vessel about to leave port 啓航旗 ; 中心有白色方塊的藍色信號旗
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1. N a signal flag of blue with a white square at the centre, displayed by a vessel about to leave port 啓航旗 ; 中心有白色方塊的藍色信號旗