Based on analyzing and summing up the cause and type of stria produced in the pittsburgh process, the author presents a method to avoid production of stria by improving structure of bridge wall and strengthening operation.是什么意思_Based on analyzing and summing up the cause and type of stria produced in the pittsburgh process, the author presents a method to avoid production of stria by improving structure of bridge wall and strengthening operation.在线翻译_英语_读音_用法_例句