chemical variation diagram

例句：

1. 1.The chemical variation diagram shows the changes in the concentration of different elements over time.
   化学变异图显示了不同元素随时间的变化。
2. 2.The chemical variation diagram helps us understand the relationship between the environment and the organisms living in it.
   化学变异图帮助我们理解环境与其中生活的生物之间的关系。
3. 3. The chemical variation diagram was used to study the effects of pollution on the ecosystem.
   化学变异图被用来研究污染对生态系统的影响。