Space,Unventilated
《英文msh詞典》Space,Unventilated
[入口詞] Space,Unventilated
[主題詞] Confined Spaces
[英文釋義] 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.