تهران

In a sentence

• من دیروز به تهران سفر کردم.

  I traveled to Tehran yesterday.

  In this sentence, 'تهران' is used as a proper noun referring to a specific location—Tehran, the capital city of Iran.

• تهران یکی از پرجمعیت‌ترین شهرهای ایران است.

  Tehran is one of the most populous cities in Iran.

  Here, 'تهران' appears as the subject of the sentence, emphasizing its characteristic as a city within Iran.

• در تهران، فرهنگ و تاریخ با هم ترکیب شده‌اند.

  In Tehran, culture and history have blended together.

  In this context, 'تهران' is employed to denote the location where the depicted scenario of cultural and historical blending occurs.