自動控制的根本問題是在存在干擾的情況下維持期望狀態(tài)。
The past is always constructed from the present.
The important thing in life is to have a great aim，and the determination to attain it.
Stories are like spells, they have the power to enchant and transform.
水邊的蘆葦在夜晚披上寒霜，月色清冷，山色蒼茫