Human error may have been a contributing factor.
人为的失误可能是一个起作用的因素。
One expert said he thought human error may have been involved.
一个专家认为，事故应该涉及人为错误。
Officials still think mechanical or human error may also have been a factor.
官员还认为机械和人为的因素也是原因之一。
Officials still think mechanical or human error may also have been a factor.
官员还认为机械和人为的因素也是原因之一。
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