欢迎来天津做客的英文表达方式有很多种，例如：
Welcome to Tianjin.
It's a pleasure to have you in Tianjin.
We're happy to have you as our guest in Tianjin.
Tianjin is happy to welcome you.
这些表达方式的来源都是源于英语的传统礼仪和文化。在英语中，欢迎客人的话语通常表示对客人的尊重和礼貌。
下面是一些例句：
We're glad to have you here.
It's an honor to have you as our guest.
We're honored to have you visit us.
以上是一些欢迎来天津做客的英文表达方式。