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。

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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。

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This technology has the advantages of simple operation, high yield and low cost by using water as solvent which is poisonless and pollution free.

该工艺条件具有操作简单、产量高、无毒无污染、成本低等特点。

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Automakers are working furiously on fuel-cell technology, in the hope that it will free us from our dependence on fossil fuels and reduce pollution.

FORBES: Fueling Hope