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.
冰冻在永冻层中的甲烷也能随着永冻层的融化而释放。
It also can be released directly as stored methane already in the permafrost is released as it thaws.
永冻层之下的土壤越硬，所需要的药室装药量也越大。
The harder the material under the permafrost is, the larger the chamber charge required .
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