不对,应该是hug sb by the arm,因为这是一个固定搭配,动词+介词+the +人体部位。中文意思是,拥抱某人的手臂同类例句The officer grabbed him by the arm.警察抓住了他的手臂。He seized her by the arm.他抓住她的胳膊。She was led by the arm to a small room at the far end of the corridor她被拉着胳膊带到走廊另一头的一个小房间里。