来自protrude,突出，伸出。

1. He grabbed at a protrusion of rock with his right hand.

他用右手抓住了一块凸起的岩石。

2. a protrusion on the rock face

岩石表面的突起部分

3. Thumb - sucking can cause protrusion of the teeth.

经常吮吸拇指能使牙齿向外突出.

4. Diagnosis and treatment of ruptured lumbar disc protrusion ( 32 cases report )

破裂型腰椎间盘突出症的诊断与治疗 ( 附32例报告 )

5. Etiological Survey on Chronic Protrusion of Cervical Intervertebral Disc ( 28 cases analysis )

慢性颈间盘突出症发病因素探讨 ( 附28例分析 )