noun
the two great powers
Refers to two major nations or powers, often in a geopolitical context. The definite article is implied in Japanese usage.
冷戦時代、世界は二大強国によって二分されていた。
During the Cold War, the world was divided by the two great powers.
Compound of 二 (ni, 'two') + 大 (dai, 'great') + 強国 (kyōkoku, 'powerful nation').