joint line

例句：

1. 1. The doctor examined the patient's joint line for signs of injury.
   医生检查了病人的关节线，以查看受伤的迹象。
2. 2. During surgery, the surgeon made a joint line to guide the cutting.
   在手术中，外科医生制作了一个关节线来引导切割。
3. 3. The team used a joint line to align their equipment for the next move.
   团队使用一个关节线来对准他们的设备，以便下一步行动。