what does "you don't say"mean? and how to use it?

American drama im into the american drama "bones" very much recently,the face structure of the actress is cubic(can i say so?ha~).i like the friendship between bones and booth.i think it is better to be friends rather than lovers for them.my friend told me teeth is the hardest bones of our body,is that true? ps:i want to say thank you to iangreen for aswering my question.i don't know how to reply him in Q&A section,,,,,o(╯□╰)o........

the city i think the city im living in is a good place for travelling, but not for living, terrible weather....it is said that there is no spring in this city, cuz it is too short. and i think, there is no autumn either, cuz it is as hot as summer now and winter is coming soon. plus, the mid-autumn day is coming~haha~enjoy the short holiday with my friends ~^.^~

Good news & Bad ones Good: the new oriential called me to go to the second round interview, such a big surprise, and such a big challenge to me~~~ Bad: a little insect climbed on my table in a sudden, gave me a scare, i dont like insects, all of them~~!!~~~~(>_<)~~~~

what happened today? running away from the class, went to an interview of the new orental, on the purpose of gaining experience of interview, learnd a lot. so so nervous and i didnt know what i have said. a little bit stupid,,,,people there were gifted in many ways, and they speak fluent english, i must study hard!!!!

embarrassed or shocked? i like to use "囧(jiong)" in daily life,is it embarrassed or shocked in english?could anybody tell me,plsease?

about the Teachers' Day Teachers' Day is coming,i want to learn this sentence"老师您辛苦了(lao shi nin xin ku le)"..could i just say " thanks teacher "? thanks^^

keep writing i dont like keeping a diary lol,,,something should be remembered,but doing the same things everyday,nothing new,,what should i remember??get a vocabulary book,just remember some new words (i dont like doing this either,hehe~~).

just saying something will graduate next year,idk if i can have the job i like,buzy with making resume,sending them and waiting for any reply.treasure my wonderful school life,,feeling a little bit sad,but that's okay.i can handle it O(∩_∩)O