The policemen investigated the causes of the accident .
警察调查了车祸的原因。
The police finally had access to the causes of the accident.
警方最终查找到造成事故的原因。
Without them, the full causes of the accident may never be known.
如果找不到黑匣子，那么造成本次空难的完整原因就可能永远无法被发现。
Without them, the full causes of the accident may never be known.
如果找不到黑匣子，那么造成本次空难的完整原因就可能永远无法被发现。
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