As a matter of fact, yeah, I've got a showing.事实上，没错，我还有个展览

as a matter of fact事实上

As a matter of fact, I've never been there before.

事实上我从未到过那儿。

As a matter of fact, light is a form of energy.

其实，光是能的一种形式。

You really have been carrying on with my wife.你还真跟我妻子有一腿啊

carry on与…有不正当的男女关系（常与with连用）

I mean, dealing in black market auctions,我是说混迹于非法拍卖场

deal in经营； 买卖

We deal in hardware but not software.

我们只经营硬件而不经营软件。

We deal in a great variety of items.

我们可以多项经营。