腹鳍牵引肌protractor ventralis muscle
异物取除器protractor
奥特赛量角器Odessey protractor【航】
镀铬游标万能角度尺universal chrome-plated vernier angle protractor
背鳍伸肌musculus protractor pinnae dorsalis
下颔伸肌musculus protractor hyomandibularis
平移角尺parallel motion protractor【测】
腹鳍引肌protractor ventralis muscle