告別詞句型：1）first of all, allow me to thank all of you for your kind invitation to the gathering.2）i have gained a lot from my visit.3）i avail myself of this opportunity to express my gratitude to you again.ladies and gentlemen,first of all, allow me to thank all of you for your kind invitation to the gathering. i am greatly honored to have such a chance to visit your university. my visit is both interesting and memorable. it is not only a source of pleasure but also an opportunity to discuss some important problem with the scholars here. i have gained a lot from my visit. i will treasure your friendship.i avail myself of this opportunity to express my gratitude to you again. may the friendship between our two colleges be further developed.goodbye, dear friends!l useful expressions1）i am greatly privileged to have had a chance to visit … and meet with so many of its people.2）i wish the fraternal chinese people prosperity and happiness.3）may the friendship ties between our two peoples be further developed and consolidated.