展会欢迎词的英文表达是 "welcome speech for a trade show"。展会欢迎词通常是在展会开幕式上由主办方或某位嘉宾发表的一种讲话，旨在向来参加展会的嘉宾、媒体以及其他相关人员表示欢迎。

下面是一些展会欢迎词的英文例句及其中文翻译：

"On behalf of the organizing committee, I would pke to extend a warm welcome to all of our guests and participants at this year's trade show. We are thrilled to have so many talented professionals joining us for this exciting event."

（代表组委会，我想向所有来参加今年展会的嘉宾和参与者表示热烈欢迎。我们非常高兴能有这么多有才华的专业人士参加这一令人兴奋的活动。）

"We are honored to have the opportunity to host such a prestigious event, and we hope that all of our attendees will have a memorable and productive experience at our trade show. Thank you for joining us."

（我们很荣幸能有机会举办这样一场著名的活动，希望所有参与者都能在我们的展会上有一次难忘而富有成效的体验。感谢您的参与。）

"We are excited to showcase the latest products and innovations from some of the industry's leading companies. We hope that you will take the time to explore all that our trade show has to offer and make valuable connections with your peers and potential business partners."

（我们很高兴能展示一些行业领先公司的最新产品和创新。希望您能花时间探索我们展会所提供的所有内容，并与同行和潜在商业伙伴建立有价值的联系。）