That's the hope of a team of researchers who have developed a paper sensor containing nanostructures that change color when they bind to compounds that indicate spoilage such as free radicals or food contaminants we can't see or smell.

这是一组研究人员的希望，他们开发了一种包含纳米结构的纸质传感器，当它们与表明腐败的化合物（例如我们看不到或闻不到的自由基或食物污染物）结合时会改变颜色。