____ learning: why do we need it?Our world is changing around us in such a frantic ____ that if we do not continue to grow and ____; we will soon be ____. In the 21st century, we all need to be lifelong ____. We need to continually keep our skills ____ and ____ date so that we have an edge in all we do. Of course, we all have a natural desire to learn for ____ to change, ____ and fulfilling our lives. This review article is an ____ to present the main ____ which follow lifelong learning.

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