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national power
歴史家は帝国の国力の衰退を語った。
The historian spoke about the empire's decline in national power.
政治家は演説でライバル国との国力の差を訴えた。
In his speech, the politician emphasized the gap in national power with rival countries.
戦国時代、諸大名は国力の強化に必死となって争った。
In the Sengoku period, feudal lords fought desperately to strengthen their national power.