矿产和金属加工业的各类机器操作员之间具有很小的流动性。
There is little mobility among the various types of machine operators within the mineral and metal processing industry.
目前集团主要服务行业有：造纸及印刷业、木业、金属加工业和塑料橡胶回收业等。
The group currently provides services in paper and printing industry, wood and metal processing industry, rubber and plastics recycling industry, etc.
这种约束对于当今动态的加工生产环境和产品的质量来说具有很大的实际性和重要意义，如在金属加工业、食品加工工厂里都存在这样的约束。
Because this constraint is more relevant and meaningful for today's dynamic producing environment and the quality of products, such as the metal and food industries.
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