These materials are now known to let out harmful gases.
这些材料被公认为会释放有害气体。
In case of a fire, wont produce toxic or harmful gases. low smoke.
在为灾发生时，不会产有毒有害气体，发烟量低。
They absorb harmful gases and release oxygen so that you can have clean air.
他们吸收有害气体，并释放氧气，这样您可以有干净的空气。
These gases are very harmful, causing disease and even death.
这些气体是非常有害的，造成疾病，甚至死亡。
These gases are very harmful, causing disease and even death.
这些气体是非常有害的，造成疾病，甚至死亡。
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