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Until 2001 the phenomenon of the negative refraction has been experimentally verified first by using artificial left-handed materials realized by periodic arrays of split ring resonators (SRRs) and wire strips .

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In the 1st paragraph of section 1 ¡°Until 2001 the phenomenon of the negative refraction has been experimentally verified¡± if you mean ¡°until 2001¡± (2001 is the ending point), then ¡°has been¡± has to be changed to ¡°had been¡±. If you mean ¡°since 2001¡± (2001 is the starting point) then there is no problem with ¡°has been¡±.

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tsingtao2008

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Not until 2001 was the phenomenon of the negative refraction experimentally verified.
OR:
The phenomenon of the negative refraction was experimentally verified for the first time in 2001.
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5Â¥2011-04-01 15:22:41
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bear1984

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