欢迎/开幕/闭幕词welcome opening/closing speech/ address
致开/闭幕词give/make/deliver an opening speech
开/闭幕式opening/closing ceremony
签字仪式signing ceremony
友好访问goodwill visit
宣布…开幕declare …opening(commencing)/ closing
发表热情友好的讲话
热情洋溢的欢迎词gracious speech of welcome
东道国host country
值此……之际on the occasion of
以……的名义in the name of
由衷的谢意heartfelt thanks
承蒙/应……的盛情邀请at the gracious invitation of
荣幸地答谢您给予我们的热情招待reciprocate
愉快地答谢你热情洋溢的欢迎词
增进我们彼此之间的理解和友情
promote/improve/enhance/strengthen/increase/ expand our mutual understanding and friendship
促进我们之间的友好合作关系
reinforce/facilitate/advance
回顾过去look back on the past/ in retrospect 展望未来look forward into future/
最后in closing
last but not the least
提议祝酒propose a toast
我很荣幸地代表中国政府和人民向来自美国的代表团表示热烈的欢迎。

On behalf of the government and people of China, it’s my great honor to extend my warm welcome to the American delegation.
我谨向各位表示最热烈/热诚的欢迎。

I would like to extend my warmest/cordial welcome to all of you.
请允许我向远道而来的贵宾表示热烈的欢迎及亲切的问候。

Honorable/ respected/ distinguished guests
Please allow me to extend my warm welcome and sincere greetings to your distinguished guests from afar.
我特别高兴能有机会招待我们的贵宾。

我祝愿本界年会圆满成功，并祝各位在北京过得愉快。

I wish the annual meeting a complete success and wish everybody a happy/pleasant stay in Beijing.
非常感谢您给我这次极好的机会访问这座美丽的城市，有机会与您合作共事。

为贵方的友好接待和盛情款待我谨对您表示衷心的感谢。

Hospitality
我愿借此机会对您的帮助表示诚挚的谢意。

I would like to take this opportunity to /avail myself of this opportunity to Earnest gratitude 请允许我请各位与我一起举杯，为我们两市的友谊与合作干杯。

May I ask you to join me in a toast to the
friendship and cooperation between our two cities!。