Was heißt »Fachgebiet« auf Englisch?

Das Substantiv Fachgebiet lässt sich wie folgt von Deutsch auf Englisch übersetzen:

Deutsch/Englische Beispielübersetzungen

Mode ist nicht mein Fachgebiet.: Fashion is not my specialty.; Fashion is not my speciality.
Das ist nicht mein Fachgebiet.: That is not my line.
Die Philosophie ist nicht so ein schwieriges Fachgebiet, wie du glaubst.: Philosophy is not so difficult a subject as you imagine.; Philosophy is not as difficult a subject as you think.
Das liegt außerhalb meines Fachgebiets.: This is outside my area of expertise.
Das Fachgebiet von Herrn Smith ist die Wirtschaft.: The study which Mr Smith specializes in is economics.
Frauen, die einen Informatikabschluss anstreben, fühlen sich oft allein und isoliert, da das Fachgebiet überwiegend von Männern dominiert wird.: Women pursuing computer science degrees often feel alone and isolated, since the field is overwhelmingly dominated by men.

That subject is taboo. We do not speak about it.
Is maths your favourite subject at school?
Is mathematics your favourite subject at school?
My daughter's favourite subject at school is art.
Tom has done research on the subject for over thirty years.
He has written at least three books on the subject.
Because of its proximity to Jupiter, Europa is subject to impacts with space debris and intense electron radiation generated by the planet. Each of these impacts can stir up the surface of the moon.
We deliberately avoided raising the subject.
We deliberately avoided raising that subject.
This subject often comes up in Proust.
It's a subject that appears often in Proust.
Zoology is my favourite subject.
Tom doesn't keep to the subject.
This brings us to our subject.
Don't bring this subject up in front of him.
Avoid bringing that subject up in front of him.
Avoid bringing that subject up in front of her.
Don't bring this subject up in front of her.
Art is my son's favourite subject at school.
She is regarded as the leading authority on the subject.