谁能帮我看看我的实习证明这样写可以不?CertificateofInternshipThisistocertifyMs.XXXhasinternedatthiscompanyfortwentydaysfrom12thto31st,July2010.Duringthisperiod,shehasadroitlymasteredvariousexperimentssucha

Question

谁能帮我看看我的实习证明这样写可以不?
Certificate of Internship
This is to certify Ms.XXX has interned at this company for twenty days from 12th to 31st,July 2010.
During this period,she has adroitly mastered various experiments such as determination of volatile phenol,fast determining COD and DO by spectrophotometer and nearly all the experiments concerning about determination of main indexes of water samples.She has also gained proficiency in the usage method of some complicated equipment like gas chromatograph and flame ionization detector(FID).I highly appreciate her effort and diligence as she would like to participate in the job of collecting water simples which is really a hard work that we only assign males to cover the part.To speak of,it is very hot in summer,especially in late July and samplers would spend more than seven hours working outside.
In sum,Ms.XXX has acted as an aggressive and outstanding member,and has kept learning professional skills and theories.She has finished this internship,proved to be a self-disciplined and competent team-worker.

Answer 1

整体还是不错的,主要有以下三点问题：
1.concerning about建议改成concerning with,前者“担心、关心”的含义偏多,后者才是“与……有关”
2.usage method建议去掉method,usage本身就已经有使用方法的意思了,再加上method就有chinglish的味道
3.最后一句语法有点问题,prove多用于被动句,建议改成She has proved herslef to be a self-disciplined and competent team-worker upon finishing this internship.