Was heißt »intern« auf Englisch?

Das Adjektiv intern lässt sich wie folgt von Deutsch auf Englisch übersetzen:

Deutsch/Englische Beispielübersetzungen

Sie haben die Angelegenheit intern geregelt.: They've dealt with the matter internally.; They dealt with the matter internally.
Das ist nur zum internen Gebrauch bestimmt.: This is for internal use.
Tom kopierte alle Daten seiner internen Festplatte auf eine externe.: Tom copied all the files on his internal hard disk to an external hard disk.
Es ist ein interner Fehler aufgetreten.: An internal error has occurred.

The Algerian regime, unable to cope with an inflammatory internal context, seeks war under any pretext.
Tom is explaining the way an internal-combustion engine works.
I'm afraid that I have internal bleeding.
Tom died of internal injuries.
A star is a brilliantly glowing sphere of hot gas whose energy is produced by an internal nuclear fusion process.
Neptune generates more heat than it absorbs from the Sun, indicating it has its own internal heat source.
Just like Jupiter, Saturn emits twice as much heat as it absorbs from the Sun indicating it also has an internal heat source.
Our client wants to build a house with an internal courtyard in order to avoid unwelcome gazes from the outside.
We think, dream and remember in pictures and carry within us a large internal archive.
They should not intervene in the internal affairs of another country.
He suffered internal injuries in the car accident.
I'm afraid I have internal bleeding.
No country should interfere in another country's internal affairs.
That country intervened in the internal affairs of our nation.
After that, internal temperature begins to climb rapidly.
That is an internal affair of this country.