氧气通过减压调节器和关断活门流向氧气面罩。
Oxygen flows through the pressure reducing regulator and shut off valve to the masks.
减压器：你们的减压器有两个功能，作为调节器和减压器。
The unloader: The unloader that you have serves two functions, a regulator and an unloader.
减压器：你们的减压器有两个功能，作为调节器和减压器。
The unloader: The unloader that you have serves two functions, a regulator and an unloader.
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