Teheran

例句：

1. 1. The city of Teheran is located in the northwestern part of Iran.
   德黑兰市位于伊朗西北部。
2. 2. Teheran was once a thriving port city, but now it's struggling to recover.
   德黑兰曾经是一个繁荣的港口城市，但现在正努力恢复生机。
3. 3. The Teheran International Airport is one of the busiest airports in the Middle East.
   德黑兰国际机场是中东地区最繁忙的机场之一。