service line

• 指网球、羽毛球或排球中标志发球区边界的线，也指专门提供客户支持或公用事业接入等服务的区域。

A line marking the boundary of the service area in tennis, badminton, or volleyball, or a designated area for providing services such as customer support or utility connections.

1. Tennis court lineB1formal

   A line on a tennis court that is parallel to the net and marks the boundary for serving.

   发球线

   • The serve must land beyond the service line to be valid.
   • He stepped on the service line during his serve, resulting in a fault.
   • The ball hit the service line and was called in.

2. Volleyball court lineB1formal

   A line on a volleyball court that marks the area from which a player serves.

   发球线

   • The server must stay behind the service line until the ball is hit.
   • She stepped over the service line, causing a foot fault.
   • The ball landed just inside the service line.