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
This technology has the advantages of simple operation, high yield and low cost by using water as solvent which is poisonless and pollutionfree.
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。
3
Long extension wire technology has extended an accurate, low cost, pollution-free advantage of the good prospects for the development and popularization.