这个词是什么意思？
A space which has limited openings for entry and exit combined with unfavorable natural ventilation such as CAVES, refrigerators, deep tunnels, pipelines, sewers, silos, tanks, vats, mines, deep trenches or pits, vaults, manholes, chimneys, etc.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D020378 · MeSH 2026。
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