natural concept

例句：

1. 1. The scientist proposed a new natural concept for the problem.
   这位科学家提出了一个解决该问题的全新自然概念。
2. 2.In his book, he introduced a natural concept of environmental conservation.
   在他的书中，他引入了一个关于环境保护的自然观念。
3. 3.The concept of sustainable development is gaining more attention in the field of ecology.
   可持续性发展的概念在生态领域越来越受到关注。