金识源专版高中英语Unit3LifeinthefutureReading素材新人教版必修5.doc
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1、Maglev Train磁悬浮列车 Q: What does maglev mean?A: Maglev is short for magnetic levitation(漂浮), which means that these trainswill float over a guideway(导轨) using the basic principles of magnets to replace the old steel wheel and track trains. Q: What is guideway and how does it work?A: The magnetized coi
2、l(电线圈) running along the track, called a guideway, repels the large magnets on the trains undercarriage (车盘), allowing the train to levitate(飘浮) between 0.39 and 3.93 inches (1 to 10 cm) above the guideway. Oncethe train is levitated, power is supplied to the coils within the guideway walls to creat
3、e a unique system of magnetic fields that pull and push the train along the guideway. The electric current supplied to the coils in the guideway walls is constantly alternating to change the polarity (极性) of the magnetized coils. This change in polarity causes the magnetic field(磁场) in front of the
4、train to pull the vehicle forward, while the magnetic field behind the train adds more forward thrust (推力). Q: How many components are there to a maglev train rail system?A: The magnetic field created in this wire-and-battery experiment is the simple idea behind a maglev train rail system. There are
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