| TO | old tuberculin; oral temperature; original tuberculin; target organ; telephone order; thoracic ortho... |
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| UAO | upper airway obstruction |
| UTO | upper tibial osteotomy; urinary tract obstruction |
| UUO | unilateral urethral obstruction |
| obstruction |
is impeding the progress of an opponent when not being able to play the ball yourself. You are obstructing if you run between your opponent and the ball or use your body as an obstacle but cannot play the ball yourself. The male three touch rule for coed and the double touch rule after a kickoff or restart are examples of where you can be within playing distance of the ball, but not legally be able to play the ball.
출처: www.lamesaindoorsoccer.com/introanddefinitions.htm
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