a powerful army的用法和样例：
- A powerful army is not easily defeated.
- The Soulscar clan has sent a powerful army which should deal with the upstart once and for all.
- Today a powerful army of fire fighters stands ready to help the moment a fire breaks out.
- It showed the inability of the United States to throw a powerful army without delay into the battle in France.
- TheAssyrian kings claimed that, not only did gods grant them kingship, but also granted them a powerful army and a great of wealth, hence army and wealth were the bases of the Assyrian monarchy.
- There was a power cut and all the lights went out.