Sports A resonant metal strip, 24 or 30 inches (61 or 76 centimeters) high, across the bottom of the front wall of a racquets or squash court above which the ball must be hit.

• 发球限制线：横过网球或橡皮球场地前墙底部的金属条，有24或30英寸(61或76厘米）高，必须把球从上方击过球网