equivalence of expression

例句：

1. 1. The two countries have a50:50 equivalence in population.
   这两个国家的人口比例为50:50。
2. 2. Theequivalence of the two sides iscrucial to the peace process.
   双方的平等关系对和平进程至关重要。
3. 3. Theequivalence oftheir interests makes it difficult forthem to reach an agreement.
   他们利益的等价使得达成协议变得困难。