source of force造句

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。
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。
It's difficult to find source of force in a sentence. 用source of force造句挺难的