a goal has been scored的用法和样例：
- After a goal has been scored the ball must be placed on the center spot and the match restarted.
- As neither of the two teams had gained any points,they decided to play the match out until a goal had been scored.
- A goal may be scored directly from the kick-off.
- The North Americans downed Korea DPR 2-1 in the final at Chile 2008, an event where more goals have been scored than at any previous edition.