【摘 要】
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American football is a sport played by two teams of eleven players on a rectangular field with goalposts at each end.The offense,the team with control of the fo
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American football is a sport played by two teams of eleven players on a rectangular field with goalposts at each end.The offense,the team with control of the football(an oval-shaped ball),attempts to advance in the field by running with or passing the ball,while the team without control of the ball,the defense,aims to stop their advance and take control of the ball for themselves.The offense must advance at least ten yards in four downs,or else they will turn
American football is a sport played by two teams of eleven players on a rectangular field with goalposts at each end. Offense, the team with control of the football (an oval-shaped ball), attempts to advance in the field by running with or passing the ball, while the team without control of the ball, the defense, aims to stop their advance and take control of the ball for themselves. offense must advance at least ten yards in four downs, or else they will turn
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