While at university, he also undertook production training at Pyongyang Textile Machinery Factory, as a road-working apprentice and as a worker building TV broadcasting equipment.

大学期间他作为学徒工和生产电视广播设备的工人在平壤纺织机械厂参加生产训练。

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And the reason why productivity is so high is because of the vast amount of capital and machinery that each US worker gets to work with.

FORBES: Why Mass Employment in Manufacturing Isn't Coming Back: It's The Productivity