a powerful nation的用法和样例：
- A country only depending on its tradition will neve become a powerful nation.
- In the adjustment of may differences that may exist or arise to exhibit the forbearance becoming a powerful nation rather the sensibility belonging to a gallant people.
- There was a power cut and all the lights went out.
- The medicine did his stomachache a power of good.
- He met a powerful opponent in the match.
- This athlete has a powerful frame.