Human error may have been a contributing factor.
人为的失误可能是一个起作用的因素。
We must allow for human error.
我们必须考虑到人为的.失误。
It was largely a matter of trial and error.
这主要是个反复实验的问题。
He had made a humiliating tactical error and he had to go.
他犯了一个让他颜面尽失的战术错误，只得引咎辞职。
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