For the purpose of iterative efficiency and practicality, Fletcher-Reeves conjugate gradient method is modified by the application of re-beginning technique, FFT algorithm and construction of initial guess.是什么意思_For the purpose of iterative efficiency and practicality, Fletcher-Reeves conjugate gradient method is modified by the application of re-beginning technique, FFT algorithm and construction of initial guess.在线翻译_英语_读音_用法_例句