据初步调查，事故系矿井下电缆短路引发火灾。
An initial investigation indicates the fire was caused by a short circuit in underground cables.
经警方初步调查，死亡原因疑为热水器煤气中毒。
An initial investigation showed a gas water heater could have caused the accident.
毕竟，大都会的黑客行为的初步调查是缓慢的和不称职的。
After all, the Met's initial investigation into hacking was slow and incompetent.
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