What would a negative index of refraction look like?
如果折射率是负的,会发生什么事情?
The negative index interpretation was soon challenged, however.
不过这项对于负折射率的诠释很快就受到质疑。
Only in 2008 did the IPD index of global commercial property show a negative return.
全球商业地产指数仅在2008年出现过负增长。
Only in 2008 did the IPD index of global commercial property show a negative return.
全球商业地产指数仅在2008年出现过负增长。
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