#82 How to cut sharp edges ?

[LILY CHOU]

I have a stl file, and I have to adjust my geometry to meet the specification.
I need to "Cut out all sharp edges" . How should I do?
and I attach the demo stl . The triangle faces are uniform, but there are some thin and sharp triangle in mine.
I want to adjust it . Is there any recommendation?
it is my stl
https://drive.google.com/file/d/0B8DmIZF8RFP2a3gyVldJQmxqb2c/view?usp=sharing
it is the demo stl
https://drive.google.com/file/d/0B8DmIZF8RFP2amRDZm1lU3N0RTg/view?usp=sharing
the attached picture
https://drive.google.com/open?id=0B8DmIZF8RFP2SEN2aTBlYXYtemc