大公国的

例句：

1. 1. The king of the kingdom is the head of state.
   王国的国王是国家元首。
2. 2. The prince is the heir to the throne.
   王子是王位的继承人。
3. 3. The country has a monarchy system, with the king as the head of state.
   该国实行君主制，国王是国家元首。