PREVIEW
... ne present was deep in thought.
All their minds were pondering the source of the "carbon monoxide."
Especially Mr. Qin, the fire department captain.
With 15 years of experience as a firefighter, he had encountered many cases of carbon monoxide poisoning.
However, in his impression, the season when carbon monoxide poisoning typically occurs is winter.
Carbon monoxide poisoning often results from closed environments or improperly installed water heaters.
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