Ключевые слова: american, artificial, athletics, ball, begining, bowl, center, compete, competition, entertainment, equipment, event, field, football, game, grass, green, halfway, hashmark, kick, kickoff, line, marked, marker, national, nfl, off, pigskin, pitch, play, professional, sport, sporting, sports, stadium, stand, super, turf, white, yard, yardline,