If this is not helpful, a full-face mask may be considered.
如果这不是有益的，一个完整的面罩可以考虑。
If you have ever seen a firefighter wearing a full-face mask with an air tank on his or her back, then you have seen an SCBA system.
如果你曾看到消防员穿戴全面罩防毒面具时，背上还有一个空气瓶，那么你就见过SCBA系统了。
In this case, a full-face respirator is called for. It provides a clear face mask or clear eye pieces that protect the eyes as well.
这种情况下需要用到全面罩呼吸器，可以提供透明面罩或者只是眼部透明，就同时保护了眼睛。
Respiratory protective devices - Compressed air line breathing apparatus for use with a full face mask, half mask or a mouthpiece assembly - Requirements, testing, marking.
呼吸保护装置。与全罩式面罩、半罩式面罩或口罩一起使用的压缩空气导管呼吸装置。要求、试验和标志。
In this world full of false, no one can see the ture face under the mask.
在这个充满虚伪的世界里，谁能看得见面具下的真面孔。
Main structured items are: JDQM full face mask, air supply valve, pressure regulator valve, backboard, pressure gauge, alarming whistle, medium pressure tube, carbon fiber composite cylinder, etc.
主要结构有：JDQM全面罩、供气阀、减压阀、背板、压力表、报警哨、中压管、碳纤维复合气瓶等。
Main structured items are: JDQM full face mask, air supply valve, pressure regulator valve, backboard, pressure gauge, alarming whistle, medium pressure tube, carbon fiber composite cylinder, etc.
主要结构有：JDQM全面罩、供气阀、减压阀、背板、压力表、报警哨、中压管、碳纤维复合气瓶等。
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