Our country's old professional technician management system was once designed for planning economy.
推行执业资格制度是我国转变专业技术人员管理方式的重要内容之一。
Once designed, hardware is difficult and expensive to change.
硬件一旦设计完毕，要修改是困难的，并且花费也大。
Once designed, hardware is difficult and expensive to change.
硬件一旦设计完毕，要修改是困难的，并且花费也大。
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