Ключевые слова: alertness, chalkboard visual aid, closeup, coach, competition, concepts, copy space, dirty, equipment, event, green color, international team soccer, judge sports official, match sports, metal, no people, offense sporting position, penalty sports, referee, referee whistle, scoring, scoring a goal, security, shiny, silvermetal, single object, soccer ball, soccer coach whistle, soccer competition, soccer league, soccer players, soccer whistle, sports, sports team, sports training, strategies, success, symbol, team sports, template football, tournament of champions, whistle,