element of infinite order

例句：

1. 1.The theory of relativity is the fundamental element of modern physics.
   相对论是现代物理学的基础。
2. 2. The structure of a language is composed of its elements.
   语言的结构由其元素组成。
3. 3. The importance of each element in the chemical formula cannot be overstated.
   化学公式中每个元素的重要作用不容忽视。