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<正> 人们一般将蛙泳臂部动作分为外划、内划和伸臂3个阶段。传统理论认为,伸臂时,双臂应充分前伸后,再开始外划。双臂外划的同时,应向后下划动。然而,欧内斯特W·马格利索在谈到蛙泳臂部外划和伸臂动作时指出,The outsweep begins by movingthe arms out and forward when they near complete extension at the end of the recovery.Thearms trace a semicircula