speech后面跟介词of，speech of welcome 中文意思是“欢迎辞”

I have the pleasure in replying to your gracious speech of welcome.我非常愉快的答谢您热情洋溢的欢迎词。

Thank you very much for your gracious speech of welcome.我非常感谢您热情洋溢的欢迎辞。