- 问题详情:Sailorsusedtospeakofa“Jack”whentheymeantaflagwhichwassetnearthebowofasailingship.Theflagshowedthecountrytowhichtheshipbelonged.TheUnionJackbecametheflagofGreatBritain.Australia'sflaghastheUnionJackinthetoplefthandcornertogetherwiththestars...
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