In the world does not have the difficult matter, so long as is willing to climb.

世上无难事，只要肯登攀。 知识来自于学习、经验来自于实践、成长来自于前辈的指导。

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System stability analysis is an important and difficult matter in the automatic control theory.

系统稳定性的判定是自动控制理论中的重点内容，也是自控理论教学中的难点。

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The accurate estimation of wind and earthquake loads is a very difficult matter.

准确估计风荷载和地震荷载是非常困难的。

youdao

Where to direct the anger and the blame is a more difficult matter.

FORBES: Sicko's Shortcuts

Ms Godfrey, however, said the intermittent nature of the technical issues reported by some schools made this a difficult matter to resolve.

BBC: Education Committee

So it was a difficult matter, but if you really peeled of the onion, so to speak, you saw that hey, this is not exactly what it appears to be.

BBC: [an error occurred while processing this directive]