Football Field Match Venue Specification
The standard size of a professional football field is between 50 and 100 yards long and between 40 and 80 yards wide. The recommended goal post size is 8 yards wide and 8 feet high. The recommended penalty area size is 18 yards wide and 44 yards long. The center circle must be 10 yards in diameter. The corner arc must be one-quarter of a circle with a radius of 1 yard. The penalty spot must be 12 yards from the goal line.
The corner flags must be 5 feet high and the goal posts must be securely fastened with a minimum of 2 feet of ground clearance. All lines must be marked with white or yellow paint， and all goal posts and cross bars must be made of a non-metallic material. The ball must be of an approved size and shape， and the match must be played with an appropriate match ball.
The playing surface must be flat， firm， and free of any foreign objects. The field must be well-lit and the playing surface must be free of puddles and other water hazards. The goal posts， cross bars， and other equipment must be placed so as not to interfere with play.
Finally， the referee must be present at all times and the rules must be strictly enforced. All players must wear the proper attire and no weapons are allowed on the field. The goalkeepers must wear a different color jersey than their team mates in order to distinguish them from the other players.
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