"اَلْمُتَرْجِم مُتَرْجِم سَريع."

Translation: The translator is a fast translator.

[Elena_jm]

Why the ''-moon" sound in the end of mutarjim?

[Hendo157698]

The simple answer is that if a noun doesn't have الـ at the beginning it usually ends with -un ٌ / -an ً / -in ٍ

مُعَلِّمٌ
Mu3allimun

If it starts with الـ then there isn't any N sound at the end. In this case it ends with -u ُ / -a َ / -i ِ

الْمُعَلِّمُ
Almu3allimu

There are exceptions to the rule ofcourse.

Also you don't say / read the case-endings (-u(n) / -a(n) / -i(n)) for the last word you say / read.

[Naisukhy]

Why is translator repeated twice?