"net cord" 是在网球比赛中指球碰到网线而被迫返回场地的情况。这个术语源自网球比赛中网线上的细小绳线，也称为"网线"。
例句：
"The ball just caught the net cord and landed in for a winner." (这个球刚好擦着网线落在了里面，赢得了比赛。)
"He hit the net cord, but it was ruled out." (他擦着网线击球，但被判为出界。)
"The net cord saved her from losing the point." (网线救了她一分。)