smoke-proof 防烟
smoke proof zone 防烟分区
smoke-proof mask 防烟面罩
smoke proof design 防烟设计
smoke-proof curtain 防烟幕
smoke proof and extraction 防排烟
design of ventilation and smoke-proof 防排烟设计
While not necessarily proof there is a problem, they are a "smoke alarm" suggesting there could be.
BBC: Probe into 'high death rate' hospitals extended
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