[8]“The door light will be mainly used in exits and in buildings such as hospitals and restaurants，” Xia told the Global Times.

　　[9]If light­emitting diode(LED)lights(安全口指示灯)were used with the invention at all entrances in Shenyang schools，about 700,000 kilowatt hours a year would be saved，the team said.The university is applying patents for the invention.

　　Invisibility cloak

　　[10]Many people daydream of an invisibility cloak like Harry Potter's and three graduate students in optics(光学)from Nanjing University of Aeronautics and Astronautics(航空航天)have actually invented one.

　　[11]Special Ferro­electric(铁电体)materials on the cloak reduce the scattering of light of an object wrapped with the cloak，and thus making the object “invisible”，according to Li Peining，one of the three students.

　　[12]“There are many invisibility cloaks based on various theories，but their light frequencies are different because there are some limitations on the frequencies.Our cloak can control all kinds of light frequencies by adjusting them，making the cloak more widely used，” said Li Peining.

　　[13]Li said he is confident about the future of the cloak.“With the appearance and application of new meta­materials，the cloak could be used in military battles and communications，” he said.

　　1．In which fields are invisibility cloaks used？(no more than 10 words)

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