发球界线

例句：

1. 1. The tennis player hit the ball with his forehand, hitting the serve at the baseline.
   这位网球选手用正手击球，将球发在底线。
2. 2. During the match, the referee made a call to change the scoreline due to a foul by the opposing team.
   比赛期间，裁判因对方球队犯规而更改了比分。
3. 3. After the game, the players gathered around the net to discuss their strategies for the next match.
   赛后，球员们围在网前讨论下一场比赛的策略。