Frame # 7 : the use of the hand / forearm as a propelling surface is clearly demonstrated with the right arm as adduction continues to be the source of force production 画面7 :画面清晰显示了手/小臂推水面,内收的右臂继续成为动力之源。
2.
Frame # 7 : the use of the hand / forearm as a propelling surface is clearly demonstrated with the right arm as adduction continues to be the source of force production 手和前臂作为划水面在这幅照片可以清楚地展示,右臂继续回收成为动力之源。