poor metal meaning in Chinese

主族金属

However , its further application and development have been limited by some problems in practices , such as the long processing time , the poor metal distribution , some defaults emerging in deposition layers and so on
但是，目前电铸技术存在着加工时间长，铸层均匀性差，铸层易出现缺陷等缺点，这严重制约着电铸技术的应用与发展。
But it is impossible for the traditional electroforming to be widely used due to the long process time , the poor metal distribution which is often seen . nano metal has special performance of mechanics and physics , but the making of nano metal block is difficult , and it ' s making method is not perfect , so the study of nano metal block is very difficult . man pay more attention to rapid prototyping which is a new machining method , but to make metal accessory using rapid prototyping is very difficult , it restricts development of rapid prototyping
目前电铸技术存在着加工时间长，铸层均匀性差等缺点，严重制约着电铸技术的应用与发展；纳米金属具有特殊的力学和物理性能，但是纳米金属块体的制备有一定的难度，而且制备方法也不成熟，因此对纳米金属块体性能的研究有一定的难度；快速成型作为一种新型的加工方法，越来越受到重视，但现在的快速成型技术对制造金属零件有很大的难度，这也是制约快速成型技术快速发展的一个瓶颈。