natural element meaning in English

天然元素
自然元素

Water is a fish 's natural element .
水是鱼的自然环境。
We must conserve our soil and water resourses to assure that these key natural elements are available to support productivity .
我们必须保护水、土资源，以便确保关键的自然元素能有效地维持生产。
Study on the numerical integration scheme with natural element method
自然单元法数值积分方案研究
Advances in natural element method
自然单元法研究进展
The natural element method and its computational algorithms in three dimensions
自然单元法原理与三维算法实现

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