Because I believe that she's telling the truth about one thing.
Well, at least she told the truth about one thing.
We must, however, be quite clear about one thing.
However, you should be careful about one thing here.
First of all I'm completely sure about one thing.
I need to warn you about one thing, though.
Indeed not, but let's be very clear about one thing.
Non en effet, mais soyons clairs sur une chose.
Well, I guess we've agreed about one thing.
Eh bien, je suppose que nous sommes d'accord sur une chose.
We candidly talk about one thing but do the opposite.
Nous parlons candidement d'une chose, mais nous faisons le contraire.
However, I did allow that I was curious about one thing.
J'ai toutefois avoué que j'étais curieux sur un point.
I was wrong about one thing, you are not exceptional.
J'avais tort sur une chose, vous n'êtes pas exceptionnelle.
You know, my dad only cared about one thing.
Mon père ne se souciait que d'une chose.
Therefore, we can be clear about one thing.
Par conséquent, nous pouvons être clairs sur une chose.