熊熊火焰的反光在满是烟垢的墙上跳动。

The reflection of flames danced on smoke-grimed walls.

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打开锅炉的前后烟箱门，检查密封垫片及烟垢，以决定是否更换和清理，同时检修浇注的耐火混凝土和密封石棉垫（绳）；

Open the smoke chamber of boiler; check the seal patch and smoke dirt to decide if it needs to clean up or replacement.

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