Similar machines have flown in space aboard NASA's shuttles, but they couldn't be tested for long enough to prove whether they were effective.
类似的机器也曾搭乘美国宇航局的航天飞机在太空中飞行，但无法进行时间足够长的测试来证明它们是否有效。
The 56-meter-long jet will be tested at five airports, including Osaka’s Kansai and Hiroshima during its six-day itinerary in Japan, according to news reports.
据新闻报道，在日本为期6天的行程中，这架长达56米的喷气式飞机将分别在5个机场进行试飞，包括大阪的关西国际机场和广岛机场。
But materials that have negative refractive indices have already been made (at least for light with wavelengths that are too long to be visible), so the idea could be tested fairly easily.
但是，具有正折射指数的材料已经被制作出来(至少用于对那些具有大波长而无法看到的光进行试验的材料已经制作出)，因此这种构想的试验不会大费周折。
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