The paper mainly introduces the calculating equation for piston skirt molded lines, the drawing of piston, and the design for convexity mother plate molded lines.是什么意思_The paper mainly introduces the calculating equation for piston skirt molded lines, the drawing of piston, and the design for convexity mother plate molded lines.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句