Solar energy is lauded as an inexhaustible fuel source that is pollution and often noise free. The technology is also versatile.
太阳能被称为是取之不尽的能源，没有污染，通常也没有噪声，而且用途广泛。
2
Protective production belongs to occluded biosystem in man-made control, and there are especial need and technology in production of pollution-free vegetables.
设施生产属人为控制下的封闭式生态系统，对无公害蔬菜的生产有其特殊的要求和技术。
3
This technology has the advantages of simple operation, high yield and low cost by using water as solvent which is poisonless and pollutionfree.