第1个回答 2010-07-05
have a nice summer vacation
be happy in summer vacation
have fun in summer vacation
第2个回答 2010-07-05
Have fun in the summer holiday!
第3个回答 2010-07-05
最简单的……happy holiday
太口语了点……
第4个回答 2010-07-05
Have a good time in your summer holiday.
第5个回答 2010-07-05
May you have a happy holiday!
Have a happy holiday!