B in fact, it's even a question whether a is a, but it's certainly not b, right? This much we know. In the grammatical sense there is no sort of mystification about the metaphor.

实际上，人们甚至对A是不是A都有疑问，但肯定不是，是吧，我们都知道这点，而从语法的角度来看，并没有像暗喻一样的神秘化。

youdao

B: in fact, he is very easygoing.

实际上，他非常好相处。

youdao

The fact is, I don't have a Plan B. It's beginning to worry me.

事实上，我并没有B计划。这已开始使我担忧了。

youdao

Maybe we should say, the mere fact that it's possible for A and B to be separate--for A to exist without B for example, that's clearly where they're separate-- the mere fact that it's possible for them to be separate doesn't mean that in the actual world they are separate.

也许我们应该说,A和B有可能不同,比如 可能A存在,而B不存在,这是它们明显的不同之处,它们有可能不同,并不意味着,在现实世界它们也是不同的

耶鲁公开课 - 死亡课程节选

Absolutely a fact -- A. B, it is absolutely a fact that this President does not believe Congress should leave on vacation until it has extended the tax cut to working and middle-class Americans that they received this year.

WHITEHOUSE: Press Briefing

One clear fact about our particular B-to-B audience that impacts our marketing plan is that the purchase decision cycle typically runs six months to one year sometimes even longer.

FORBES: Engineering Content For Makino

In fact, the Pentagon was so upset by these mischaracterizations of the B-2 program that Under Secretary of Defense Paul Kaminski felt compelled to issue a rebuttal of significant portions of the report.

CENTERFORSECURITYPOLICY: Center for Security Policy | SUMMARY OF THE CENTER FOR SECURITY POLICY��S SECOND HIGH-LEVEL ROUNDTABLE ON THE FUTURE OF THE MANNED BOMBER FORCE