He made an official visit to Tokyo in March.

他于三月到东京进行了一次公务访问。

Thus concluded the official visit.

就这样，代表团结束了这次参观。

What is the official visit?

什么是公式访问？

They made an official visit to the King.

他们正式拜访了国王。

They made an official visit to the king.

他们对国王作正式的访问。