hard sledding meaning in English
费力
Examples
- Luck has come our way at last, after all the hard sledding .
我们拼命苦干了多年，终于交上好运了。 - Kathy had hard sledding in her math course because she was poorly prepared
凯西的数学很难进步，因为她的基础太差。 - 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
在空燃比控制算法中，采用自学习、自适应、自校正控制虽然能达到控制要求，但其本质上仍然要求对象模型的在线识别，故算法复杂，运算量大，难于实现，并需要进行大量的台架试验，费时、费力，致使它们的应用成功率远不如人们期望的那么高。