hard sledding 中文意思是什麼
hard sledding
解釋
費力-
Luck has come our way at last, after all the hard sledding.
我們拚命苦幹了多年，終于交上好運了。 -
Kathy had hard sledding in her math course because she was poorly prepared
凱西的數學很難進步，因為她的基礎太差。 -
Among the arithmetic of air - fuel control, self - learning, self - adapting and self - correction can meet control demand but they also need on - line identifying of object model. they are complicated and need vast operation so they are difficult to realize and need lots of gantry experiments, taking time and hard sledding, which lead to their application success rate under people ' s expectation
在空燃比控制演算法中，採用自學習、自適應、自校正控制雖然能達到控制要求，但其本質上仍然要求對象模型的在線識別，故演算法復雜，運算量大，難于實現，並需要進行大量的臺架試驗，費時、費力，致使它們的應用成功率遠不如人們期望的那麼高。
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