To the difficult trouble, the system can add the steps of overhauling, and expand the knowledge base.

对于疑难故障，能添加检修步骤，扩充知识库。

youdao

He's a difficult man, and I think there's been some trouble on the shop-floor.

他是个难对付的人，而且我认为车间里出了一些麻烦。

youdao

He's a difficult man, and I think there's been some trouble on the shop floor.

他是个难对付的人，而且我认为车间里存在些问题。

youdao

Sir Edmund Hillary, the first man up Everest, used to say that if you were in real trouble in a difficult place you needed an explorer called Ernest Shackleton, because he understood his people, knew how hard it was to lead well, and was prepared to do the right thing.

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Economically, Sudan is in such deep trouble that it is difficult to see how the government indeed any Sudanese government can extricate itself.

ECONOMIST: Sudan: Through the looking glass | The

Diagnosing mental illness in children can be difficult because young children often have trouble expressing their feelings and normal development varies from child to child.

CNN: Mental illness in children: Know the signs