Low-key person also is a kind of wisdom.

低调做人也是一种智慧。

I am a quiet person, serious work, low-key person.

我是一个默默的人，认真的做事，低调的做人。

That rich man in our town is a very low-key person.

我们镇上的那个有钱人是个相当低调的人。

I hope, when you visit in China next time, I will be the key person to meet you.......

每天早晨，当客人到的时候，我要下去迎接他们，而就在这时候。

A data warehouse architect, who is the key person in data discovery and data warehouse design.

数据仓库架构师，是数据发现和数据仓库设计中的关键人物。