名词
中文翻译：骶骨底部
同义词：
['base of the sacrum', 'base of the spine', 'base of the vertebral column']
例句：
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1. Thepatient was lying on his back with his legs extended.
病人仰卧，双腿伸直。
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2.He sat down on the edge of the bed and rested his feet on the floor.
他坐在床边的边上，把脚放在地板上休息。
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3. She lay on her side, propped up by a pillow.
她侧躺着，靠枕头支撑着。