balance of power

详细解释:【法】 势力均衡

英语解释：

名词 balance of power:

an equilibrium of power between nations

例句：

Since the two main parties each won the same number of seats, the minority party holds the balance of power.由於两个主要政党都赢得了相同数量的席位，因此作为少数派的政党居於举足轻重的地位。