a senior Pentagon official的用法和样例：
- A senior Pentagon official later suggested Admiral Keating had been misunderstood.
- A senior Pentagon official said the US would "resist" the Russian move, which he said would have serious implications for American allies in Europe.
- The United States has fallback options for missile defense sites in Europe if coming negotiations with Poland and the Czech Republic fail, senior Pentagon officials said Thursday.
- She is unfit for such a senior position.