用力 yònglì HSK7 exert Origin Definitions Defs Strokes Stroke Words Sentences Sents 作用力 zuòyònglì action force (physics) action force反作用力 fǎnzuòyònglì reaction force (physics) reaction force弱作用力 ruòzuòyònglì weak force the weak force (in particle physics)强作用力 qiángzuòyònglì strong force the strong force (in nuclear physics)