| 词汇 | sacrum | 
| 释义 | sacrum  noun [ C ]  anatomy specialized uk/ˈseɪ.krəm/ us/ˈsæk.rəm/  sacra or sacrums  骶骨 a triangle-shaped bone at the base of the lower back above the coccyx (= a small bone at the base of the spine) | 
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