normal position indicator

例句：

1. 1. Thedevice is used to indicate the normal positionof the patient's head during surgery.
   该设备用于在手术期间指示病人头部的正常位置。
2. 2. The normal position indicator helps doctorsmonitor the patient's heart rate andblood pressure.
   正常位置指示器帮助医生监测病人的心率和血压。
3. 3. The normal positionindicator can be used to prevent falls inelderly people with mobility impairments.
   正常位置指示器可用于防止老年人因行动不便而跌倒。