名词
中文翻译：Unknown
同义词：
['pelvis', 'sacrum', 'coccyx']
例句：
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1. The patient's cavum pelvis was enlarged due to a tumor.
患者的骨盆由于肿瘤而扩大。
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2. During childbirth, the cavum pelvis is the area where the baby's head emerges.
分娩期间，骨盆是宝宝头部露出的地方。
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3. The doctor performed an operation to reduce the size of the patient's cavum pelvis.
医生进行了手术，以减小患者骨盆的大小。