前几天，我和爸爸、妈妈一起到西安玩儿。
A few days ago, I went to Xi'an to play with my father and mother.
“爸爸，城墙下面怎么有条河？”
"Dad, how can there be a river under the wall?"
“那叫护城河。”爸爸说。
"That's the moat." Dad said.
“为什么有护城河？”
"Why is there a moat?"
“它可以阻挡敌人的进攻。”妈妈说。
"It can stop the enemy's attack." Mom said.
“它是什么朝代修的？”
"What Dynasty was it built?"
“可能是明代的。”爸爸有些不肯定的说。
"Probably in the Ming Dynasty." Dad said with some uncertainty.
“古代人真聪明。”我摸了摸头说。
"The ancients were very clever." I touched my head and said.