火灾原因正在调查中。
大火半小时内被扑灭，火灾原因正在调查中。
The fire was put out within half an hour and the cause of the fire was under investigation.
至少有三名消防队员在救火时受伤，火灾原因仍在调查中。
At least three firefighters were injured in the blaze, the cause of which was under investigation.
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