当永冻层融化，其中的有机物质分解就会释放甲烷。
Methane is released when organic material in the thawing permafrost decomposes, which gradually releases methane.
此步骤将有机物质分解为可以使用的分子，例如糖。
This step breaks down the organic material to usable-sized molecules such as sugar.
在下降的过程中，这些有机物质可能会被吃掉、排出和分解，这样一来其营养价值就大大的降低了。
During its long descent, this organic matter may be eaten, excreted, and decomposed, drastically reducing its nutritive value.
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