Guójì shèhuì de lìliàng jūnhéng zhèngzài fāshēng biànhuà.
The balance of power in the international community is shifting.
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力量均衡 is the standard rendering in international-relations writing. The synonym 实力均衡 (shílì jūnhéng) emphasizes 'real strength,' while 势力均衡 (shìlì jūnhéng) emphasizes 'sphere of influence.'