开幕/闭幕式  opening/closing ceremony

开幕词 opening speech/address

致开幕词  make an opening speech

友好访问  goodwill visit

阁下  Your/His/Her Honor/Excellency

贵宾   distinguished guest

尊敬的市长先生  Respected Mr.Mayor

远道而来/来自大洋彼岸的朋友
friends coming from a distant land/the other side of the Pacific  

东道国  host country

宣布……开幕  declare……open

值此之际  on the occasion of

借此机会  take this opportunity to

以……名义  in the name of

本着……精神  in the spirit of

代表  on the behalf of

由衷的谢意  heartfelt thanks

友好款待  gracious hospitality

正式邀请 official invitation

回顾过去  look back on

展望未来  look ahead/look into the future

最后 in closing

圆满成功  a complete success

提议祝酒   propose a toast

我愿借此机会，代表我们代表团的全体成员，对我们东道主的诚挚邀请，表示真诚的谢意。
  
On the behalf of all the members of my mission, I would like to take this opportunity to express our sincere thanks to our host for their earnest invitation.

现在，我愉快地宣布第二十二届万国邮政联盟大会开幕。
Now, I have the pleasure to declare the 22nd Universal Postal Congress open.

我很荣幸地代表中国政府和人民向来自联合王国的代表团表示热烈的欢迎。
I have the honor to express this warm welcome on behalf of the Chinese Government and people to the delegation from the United Kingdom.

我谨向各位表示最热烈的欢迎。  
I would like to extend my warmest welocme to all of you.

我预祝大会圆满成功！  
I wish the conference a complete success!