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How do i understand translate surface of extrude features?What do I do with this function?

Question asked by Bluesky Toucher on Apr 1, 2014
Latest reply on May 5, 2014 by Jerry Steiger

In solidworks Help ,I find this explanation.

aa.png

 

but, Why?

Why do it become this shape?

what usage for this function?

 

Thanks!

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