Have you been to that convention center before?

你以前去过那个会议中心吗？

It is to be held in the national convention center.

会议将在国际会议中心召开。

Do you know where the Internatonal Convention Center is?

你知道国际会议中心在哪儿吗？

It is to be held in the international convention center.

会议将在国际会议中心召开。

Orlando is one of the biggest convention center in America.

奥兰多是美国最大会展中心之一。