元首统治

例句：

1. 1. The monarchy is facing a crisis due to corruption and incompetence.
   由于腐败和无能，君主制正面临危机。
2. 2. The supreme power of the president has been challenged by the new policy.
   总统的至高权力受到了新政策的质疑。
3. 3. The monarchy's authority is being questioned by the people's demands for democracy.
   人民对民主的需求正在质疑君主制的权威。