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.

youdao

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.

youdao