When trying to explain yourself, try to frame the explanation as:
'I accomplished X, relative to Y, by doing Z'
(this is from Laszlo Bock of google. He said, 'some people will say, I wrote editorials for the NYT. but it would be better to say Had 50 op-eds published compared to average of 6 by most op-ed [writers] as a result of providing deep insight into the following area for three years.'