| 词汇 | swamp gas | 
| 释义 | swamp gas  noun [ C usually singular ] uk/ˈswɒmp ˌɡæs/ us/ˈswɑːmp ˌɡæs/  沼气 a gas produced in a swamp by decaying plants that are covered by water  You could smell the swamp gas a mile off. 一英里以外都能闻到沼气的气味。  | 
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