smouldering ['sməʊldərɪŋ]

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附加级

闷烧，低温炼焦，低温干馏

The bonfire was still smouldering the next day. 到了第二天，篝火还在闷燃。
The mat was smouldering where the burning log had fallen. 燃烧的木棒落下的地方垫子慢慢燃烧起来。