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。
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。
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。
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