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。
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.
系统甚至可以将建筑平面图这样的信息提供给消防员——投射到他们的防火面具上。
The system can even provide the firemen with information such as floor plans, projected onto their masks.
烟雾从燃烧的大楼几乎窒息的消防员，并迫使他们戴面具。
The smoke from the burning building almost choked the firemen and forced them to wear masks.
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