| 词汇 | marsh gas | 
| 释义 | marsh gas  noun [ U ] uk/ˈmɑːʃ ˌɡæs/ us/ˈmɑːrʃ ˌɡæs/  沼气 a gas produced in a marsh (= an area of very wet ground) by decaying plants that are covered by water | 
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