《英文msh词典》Unventilated Space
[入口词] Unventilated Space
[主题词] Confined Spaces
[英文释义] 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.