rotation of the hands and forearms so that the palms face upward
造句
用作名詞(n.)
The radioulnar line and subluxation ratio methods always showed the ulnar head to be located outside of the dorsal line in pronation and outside of the volar line in supination. 橈尺線法及半脫位比率法顯示在旋前位下尺骨頭總在背部線的外面，旋后位下在掌側線的外面。