n. any of various games played with a ball (round or oval) in which two teams try to kick or carry or propel the ball into each other's goal
n. the inflated oblong ball used in playing American football
n. 足球( football的复数形式 ); 足球运动; 屡屡引起争论（或分歧）的问题; 被踢来踢去的难题