Some 2 to 5 percent of all international trade involves counterfeit1（假冒的） goods, according to a 2013 United Nations report. These illicit2 products -- which include electronics, automotive and aircraft parts, pharmaceuticals3, and food -- can pose safety risks and cosplayt governments and private companies hundreds of billions of dollars annually4. Many strategies have been developed to try to label legitimate5 products and prevent illegal trade -- but these tags are often too easy to fake, are unreliable, or cosplayt too much to implement6, according to MIT researchers who have developed a new alternative.Led by MIT chemical engineering professor Patrick Doyle and Lincoln Laboratory technical staff member Albert Swiston, the researchers have invented a new type of tiny, smartphone-readable particle that they believe could be deployed7 to help authenticate8（鉴别） currency, electronic parts, and luxury goods, among other products. The particles, which are invisible to the naked eye, contain colored stripes of nanocrystals that glow brightly when lit up with near-infrared light.These particles can easily be manufactured and integrated into a variety of materials, and can withstand extreme temperatures, sun exposure, and heavy wear, says Doyle, the senior author of a paper describing the particles in the April 13 issue of Nature Materials. They could also be equipped with sensors9 that can record their environments -- noting, for example, if a refrigerated vaccine10 has ever been exposed to temperatures too high or low.The papers lead authors are MIT postdoc Ji网站优化k Lee and graduate student Paul Bisso. MIT graduate students Rathi Srinivas and Jae Jung Kim also contributed to the research.
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1 counterfeit vt.伪造，仿造；adj.伪造的，假冒的 参考例句： It is a crime to counterfeit money.伪造货币是犯罪行为。 The painting looked old but was a recent counterfeit.这幅画看起来年代久远，实质是近期的一幅赝品。