We'll call him Mr. X.

我们会称他为X先生。

youdao

Mr X exhibits in several galleries.

先生在几个艺术馆举办展览。

youdao

Allow me to introduce my friend Mr X (to you).

让我(给你们)介绍我的朋友某先生。

youdao

Allow me to introduce my friend Mr X (to you).

让我(给你们)介绍我的朋友某先生。

youdao