a chief of state的用法和样例：
- He served as a chief of staff in the army.
- The President cannot rudely ignore a head of state.
- Bukui was a chief of Daur in Qing dynasty, whose name was widely used.
- Question:Who’s the current leader of the Czech Republic Answer: President Vaclav Klaus is the Chief of State, and Petr Necas is the Prime Minister.
问: 谁是现任领导人捷克共和国 答： 总统克劳斯是行政国家和切赫Necas是总理。