维持

maintain; preserve; sustain; keep; hold; uphold; retain; support; continue; carry on; keep up; hold up; keep going; perpetuate; conserve; persist; prop up; hold on to; cling to; keep alive; keep in existence; keep the status quo; keep up with; keep pace with; keep step with; maintenance; upkeep; sustenance; persistence; retention; preservation

敌对势力

opposing/hostile forces

均势

balance of power; balance; equilibrium; equipoise