It is rich in resources, both free, and no transport, no pollution to the environment.
它资源丰富，既可免费使用，又无需运输，对环境无任何污染。
No pollution to the environment.
对环境没有污染。
The method has simple and convenient operation, high yield and no pollution to the environment.
该方法操作简便，产率高，对环境没有污染。
The method has simple and convenient operation, high yield and no pollution to the environment.
该方法操作简便，产率高，对环境没有污染。
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