特发此证,以资鼓励.

英文证明文件以This is to certify that ...或者I hereby certify that ...开头表示的就是“特发此证,以兹证明”的意思.
中英文公函书写习惯的区别.

XXX was awarded the second scholarship during the first semester from XXXX to XXXX
The certificate is especially approved as an encouragement.
这种证书的翻译格式都是统一的,在新西兰和澳大利亚都有这种格式,你可以上网查一下,可能说法不一致,但格式一样

荣誉证书：Certificate of Distinction
This certificate is to certify ***to win the reward of "Outstanding students" of Baodi ballet School In year 2009-2010
中文英文的格式是不一样的!

You respond to the party's call to grow one child volunteeredly for the revolution.This is the certification for it as encouragement .

在xxx举办的“让世界充满爱”慰问义演音乐会上表现优秀.
特发此证,以资鼓励
Appreciate your excellent performance on the charity concert "Keep the world full of love",
Hereby the certificate is issued to show gratitude as well as inspire for better show in future.

1.keep your certificate clean and in its place!
2.transferation forbiden
3.certificate holders should accept the security inspection by the host.
4.this certificate is owned by the organizer,and should be sent back if we declare.

Certificate of Commendation
This is to certify that XXX has been named a Student of Three Excellences for 1999-2000 and has been awarded a First-Place Scholarship.May there be more success to come.
上面的"This is to certify..."相当于“特发此证”,最后的"May there be more success to come."相当于“以资鼓励”

In Witness Whereof,it is hereby certified that XXX has participated in the voluntary service held by Beilun Volunteers Association from June,2014 to September,2014 for a total time of XX hours.For detailed information please refer to voluntary service checklist.

我试着帮您翻译下吧.然后您可以在各位翻译中选择您认为最合适的.
1、
Dear ***,
Due to your excellent performance during the 14th National Mathematics invitational tournament "Hope Cup" as the third prize in Grade two of high school,we awarded you this certificate together with a bronze medal as an encouragement.
2.
Student Zhang Dapeng,as a representative of the 5th team in Zhaoyang district,attended the 17th Computer Communication of Mathematics Science popularization Activity in Grade one,middle school in Beijing.
Wining the award:
Practice Prize
Beijing Basic Education and Teaching Research Center of Education and Science Institute
Beijing Mathematics teaching Institute
Beijing Mathematics Institute
《Mathematics teaching in primary and secondary schools》Newspaper office
March,2002

Honorary certificate
xxx At first,won the first prize in the composition contest.
Administ,as a little encouragement
XX Senior high school
December 2008

中文跟英文表达不一样,英文里面没有特发此证这一说.
一般的是以"This is to certify that ...","I hereby certify that ..."开头的表示的.

荣誉证书**送变电工程公司：荣获特变电工输变电工程”杰出贡献奖“称号,特发此证,以资鼓励.Почётная грамота награждаетсяза достойныйвклад в дело строит...