mastoid notch

例句：

1. 1.The mastoid notch is a distinctive feature of the skull.
   乳突切迹是颅骨的一个独特特征。
2. 2.The doctor carefully removed the mastoid notch to perform surgery.
   医生小心翼翼地切除了乳突切迹以便进行手术。
3. 3.The patient's head was shaved and the mastoid notch was exposed for the procedure.
   患者头部剃光，乳突切迹暴露出来以便进行手术。