University of Saskatchewan dentistry professor emeritus Dr. Kunio Komiyama and his colleague Dr. Gerry Uswak are recruiting 120 teens willing to brush with a prototype light-powered toothbrush and sit in a dentist's chair for a few extra inspections.The manufacturer, the Shiken company of Japan, is paying the researchers to investigate whether the brush, which causes a chemical reaction in the mouth, does a better job of eliminating plaque and bacteria than a conventional toothbrush.
Komiyama's first model, was described 15 years ago.
obsolete:
no longer useful, because something newer and better has been inventedￚsee also out-of-date
*obsolete weapons
*computer hardware that quickly became obsolete
*Will computers render (=make) books obsolete ?
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emeritus:
emeritus professor/director etcor professor/director etc emeritusa professor, director etc who is no longer working but has kept his or her previous job title as an honour
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recruit:
to persuade someone to do something for yourecruit somebody to do somethingI recruited three of my friends to help me move.
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prototype:the first form that a new design of a car, machine etc has, or a model of it used to test the design before it is producedprototype of/for*a working prototype of the new car*prototypes of future aircrafts were demonstrated *the prototype of a new car
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inspection:
a careful examination of something to find out more about it or to check for anything wrongfor inspectionCopies of the documents are available for inspection (=people can look at them) at local libraries.(on) close/closer inspection (=when looked at in detail) However, on closer inspection, a number of problems emerged.Close inspection of the plane's engines revealed several small defects.
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اولین سایت خبر خوان آنلاین منابع آموزش زبان انگلیسی
