The means is extension to old system and then upgrading whole system with new technology.
在方法上首先完善扩充原有系统，其次探索采用新技术逐步升级整个系统；
First, focus on upgrading production technology and adjusting the structure of steel products.
一要注重生产技术升级，调整钢铁产品结构。
Economic evaluation in environmental impact on construction project or technology upgrading project remains difficult.
建设项目或技术改造项目的环境影响经济评价至今仍是项目评估中的难点之一。
Our products . in short supply need to technology upgrading in order to meet market requirements.
产品供应不求，急需进行技术更新改造，以满足国内外市场的需求。
Our products . in short supply need to technology upgrading in order to meet market requirements.
产品供应不求，急需进行技术更新改造，以满足国内外市场的需求。
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