正如德鲁克所说，知识工作者的生产力将成为对人员进行管理的中心议题和21世纪对管理的最大挑战。
Just as Peter Drucker said, the productivity of knowledge employees will be the key issue of the human resource and the biggest challenge in the 21st century.
接着，便是图形用户界面(GUI)给大多数有知识的工作者们带来的生产力应用程序，这影响了数亿人。
Next was the Graphical User Interface (GUI) which brought productivity applications to most knowledge workers, call it hundreds of millions of people.
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