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1、（一）A backpack-carried digital nose that sniffs out simple explosive devices (lEDs) and other threats promises to ease checkpoint duty for troops stationed in hot spots around the world.Developed by Scent Detection Technologies (SDT), a small privately owned company based in Heraliya, Israel, the mil
2、itarized mininosetrademarked MN 2000-MILdetects and identifies EDs, rigged vehicles (伪装的车辆) and other hazards by the vapors or traces particles (微粒) left on skin, machinery and personal belongings.Soon to enter mass production, the MN2000-MIL is n ruggedized (强化的) version of the firms MiniNosc2000 d
3、esigned for use by law enforcement and security personnel. It is a second-generation version of Ihc firms MN1000, which has been purchased by several Asian countries, including China, which introduced the system for the Beijing Olympics.Like its former products , the system is based on company-paten
4、ted High-Frequency Quartz Crystal Microbalancc (HFQCM) technology that digitally imitates mammalian olfactory (嗅觉的) sense capable of learning to recognize new substance.It works like a supersensitive digital nose able to detect very low nanolcvcl (纳米级) amounts of any source substance,” SDT Chief Exe
5、cutive Officer Bengal said. “We then teach it to identify substances by matching them with a library of threats weve programmed into the machine.”The entire analysis process, Bengal said, takes 8 to 26 seconds, depending on substances.Unlike other trace detection systems on the market, which are bas
6、ed on radioactive-source Ion Mobility Spectrometry technology SDTs QCM-based system contains no radioactive parts.“Ion Mobility Spectrometry systems are essentially radioactive,” Bengal said. You need special licensing to sell them and specially trained personnel to service them. But were using esse
7、ntially green technology. You dont need trained technicians to operate or even open our machines.”In the two years since SDT began producing the MN2000 for the homeland security market, the system has demonstrated its ability to operate for months at a time without servicing or technical repairs. Be
8、ngal said the new military model will be much stronger, as it was designed to operate in dust, heavy fog and otherwise extreme field conditions.Digital Nose Sniffs out IEDSIntroduction A backpack-carried digital nose is intended to 71 the burden of checkpoint duty for troops stationed in hot spots.
9、It can detect or identify the explosive devices that 72 peoples lives. 73 A second-generation version has been put into practical 74 in several countries. The HFQCM technology can recognize new substances by 75 mammalian olfactory senses. These substances, which 76 the length of the entire analysis
10、process, can be matched with 77 threats programmed into the machine. The QCM-based system 78 from other trace detection systems in that it contains no radioactive parts. Technicians can operate or even open the machines 79 training.ConclusionThe new military model is more likely to 80 to severe fiel
11、d conditions（二）Among the natural creatures that can present a threat to people in rural areas of Mexico, one of the most productive is the scorpion(蝎子). These relatives of spiders kill dozens of people each year and injure thousands more. However, scorpions have become a part of the local culture an
12、d tradition. In the Durango city main market, scorpions are in evidence at every turn. There are books, key chains and lamps decorated with dead scorpions. There are scorpion images on T-shirts and hats and there are even candies shaped like scorpions. The whole place seems to be filled with the cra
13、wling creature.In one corner of the market, Chelo Garcia even sells live scorpions. She says she has experienced two scorpion stings(蛰) in the recent years and that nothing happened. She says that if a person has no symptoms of poisoning with 30 minutes of the stinging, it is likely that nothing bad
14、 will result. She says some scorpions have little or no poison and so luck plays a big part.It is hard to explain why people come to Ms. Garcias store to buy live ones, but she does a good business. She often reaches down through the top of the glass cage to catch one of the scorpions to show her cu
15、stomers. She holds them by the tail, where the barbed stinger(刺针) is located, so that she is safe from attack.In the crowded market, many people pass by Ms. Garcias store to look at the crawling creatures and to relate their own stories of encounters with the scorpions. One old woman says she nearly
16、 died when she was a girl of 18 years old and has been afraid of scorpions ever since. She said her tongue became numb and her throat began to swell shut, common symptoms of the scorpion poison. She says she survived because God protected her.Every year in Mexico about 200,000 people are stung by scorpions. The number of annual deaths was nearly 300, till 2015, but a public health c
