求翻译：可燃冰由甲烷和水构成，不含其它成分，无需净化提炼或其它加工步骤。所以利用是时产生的污染比石油以及煤等传统能源小很多。是什么意思？

Combustible ice, methane and water that does not contain other ingredients, without purification refining or other processing steps. So the use is generated when pollution than oil and coal and other traditional energy is much smaller.

Flammable ice by methane and water, and does not contain other ingredients that you do not need refining or purifying Other processing steps. So when you are using the pollution than petroleum, as well as traditional energy resources coal, much smaller.

The inflammable ice by the methane and the water constitution, including other ingredients, does not need to purify the refinement or other processing step.Therefore the use is time produces pollution compared to traditional energy and so on petroleum as well as coal small very many.

Combustible ice formed from methane and water, does not contain other ingredients, no cleaning extraction or other processing steps. Pollution resulting from the use is a lot smaller than the traditional energy sources such as oil and coal.

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