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And Chagger has personal experience of tumble dryer fires. Some years ago, a fire alarm went off in his own home – in a room where his tumble dryer was operating. "I couldn't believe my ears," he recalls but, on close inspection, he realised a thin layer of smoke was hovering beneath the ceiling above the machine. Chagger was able to deal with the fire safely and says he recommends putting a smoke alarm in the same room as a tumble dryer.
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A solution requires solving the hardest known problems in the universe, often requiring years (if not decades) of effort
（作者单位：中国社会科学院考古研究所）