2 sentences

1. 费城是宾夕法尼亚州最大的城市。

   Fèi​chéng shì Bīn​xī​fǎ​ní​yà​zhōu zuì dà de chéng​shì.

   Philadelphia is the largest city in Pennsylvania.

   Source: Dong Chinese Dictionary

2. 费城是美国历史最悠久的城市之一。

   Fèi​chéng shì Měi​guó lì​shǐ zuì yōu​jiǔ de chéng​shì zhī​yī.

   Philadelphia is one of the oldest cities in the United States.

   Source: Dong Chinese Dictionary