understand
“Since xxx is an important concept for this paper, adding a figure for its initial introduction will make its use easier to understand.”
appropriate attack
fair comparison
- 
    when show the ERROR, average error not work well. 
- 
    “In general, there is a feel that the comparison is done “apples to oranges”, as both competitor approaches use formal models of privacy (derivations of differential privacy), whereas the current approach is ad-hoc in nature.” 
utility metric selection
leave for future (dpbf)
draw a bf figure?
use better privacy metric?