A spokesman for Poland's State Forests said, " small firewood is probably the cheapest heating material in the EU countries."

“小块柴火可能是欧盟国家最便宜的取暖材料。”

Mr Carey and his colleagues report in the American Chemical Society's journal Nano that heating the new material did not eliminate the response.

凯利和他的同事们发表在美国化工科学院的期刊杂志《Nano》的文章中说，即使对这种新型材料加热，也不能消除已产生的变化。