Would you please correct two paragraphs for me? it is very important for me.Thank you in advance I appreciate you if you correct these phrases for me. I want to have them polite and respectful. Thank you again. 1- In addition to improvement of the .. equation, following the referee's opinions about the rejected paper, I have conventionally used symbols in this paper. I have also replaced linear force instead of quadratic one to avoid the unphysical assumption which was used in the rejected paper. 2- Here I want to appreciate to the anonymous referee and professor ....for their advices about the rejected paper which have helped me to write basically improved version of the last paper