火灾原因不明
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The cause of the fire is unknown.
以上为机器翻译结果，长、整句建议使用 人工翻译 。
火灾原因不明，也不清楚伤者当中有多少是儿童。
The cause of the fire was unknown, and it was not clear how many of the injured were children.
youdao
发生火灾的原因不明。
Reasons for the fire are unclear.
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