他在18年前选择从商业领域退休后，回到新加坡公共行政管理与公务员学院担任外聘讲师两年。
Choose to retire 18 years ago from his business and returned to teach 2 years later at the Institute of Public Administration Management and Civil Service College in Singapore as an external lecturer.
它们与以前的公共管理和公共行政管理概念有什么不同？
What differentiates them from previous concepts of public management and public administration?
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