For example: "the first person in space" and "the 42nd President of the United States of America", are proper.
به عنوان مثال: "نخستین فرد در فضا" ("the first person in space") و "۴۲امین رئیس جمهور ایالات متحده آمریکا" ("the 42nd President of the United States of America") هردو خاص هستند.