breathing zone meaning in English

伸缩区

And is delivered to the top of the cabin and extracted at floor level to carry any particles downwards away from the breathing zone
，然后从客舱顶部流入，于底部连同空气中不洁的微粒流出客舱外。
Health and safety in welding and allied processes - sampling of airborne particles and gases in the operator ' s breathing zone - sampling of gases
焊接及相关工艺的卫生与安全.操作人员呼吸区域内空气中悬浮颗粒及气体的抽样.气体的抽样
Health and safety in welding and allied processes - sampling of airborne particles and gases in the operator ' s breathing zone - part 2 : sampling of gases
焊接和相关工艺的防护和安全.工作人员工作区空气粒子和气体的取样.第2部分:气体取样
Health and safety in welding and allied processes - sampling of airborne particles and gases in the operator ' s breathing zone - sampling of airborne particles
焊接和有关过程的卫生和安全.操作者呼吸区域的空气悬浮颗粒和气体的取样.空气悬浮颗粒取样
Health and safety in welding and allied processes - sampling of airborne particles and gases in the operator ' s breathing zone - part 1 : sampling of airborne particles
焊接和相关工艺的防护和安全.工作人员呼吸区空气粒子和气体的取样.第1部分:气体粒子的取样