This paper lead to the principle of choose of c ut ting speed for ladder machine parts by explaining the relation of cutting speed for ladder machine parts and cost.是什么意思_This paper lead to the principle of choose of c ut ting speed for ladder machine parts by explaining the relation of cutting speed for ladder machine parts and cost.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句