1. As one of the resultant forces of history development, social mentality pays an irreplaceable role. 在历史发展的合力机制中，社会心态所起的作用是不可代替的。
2. The core value of the library refers to the belief of the library that is basic, durable and irreplaceable. 图书馆的核心价值则是指图书馆拥有的不可替代的、最基本最持久的信念。
3. The planet Earth is a valuable and irreplaceable source of water and the environment is something everyone living on this planet must protect. 地球是水资源不可替代的珍贵源泉。环境是我们每一个生活在这个星球上的人都必须保护的东西。
