THE DEDUCTION AND ANALYSIS OF MEAN VALUE FORMULA OF RELATIVE SLID SPEED UP THE HAS ALONG THE ROLL SURFACE是什么意思_THE DEDUCTION AND ANALYSIS OF MEAN VALUE FORMULA OF RELATIVE SLID SPEED UP THE HAS ALONG THE ROLL SURFACE在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句