Propagation develops within the working surface of the roll, gradually increasing in depth and width followed by a large surface spall of the overlying barrel surface.是什么意思_Propagation develops within the working surface of the roll, gradually increasing in depth and width followed by a large surface spall of the overlying barrel surface.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句