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急求修改一句英文句子,附編輯意見,在線等
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急求修改一句英文句子,附編輯意見,在線等 原文: 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 . 編輯意見: 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”. 作者本意:直到2001,XXX才開始。。。。 |
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