使用真金属，玻璃或水晶代替塑料仿制品。
Using real metal, glass or crystal instead of plastic simulations.
如果第九层的设计主题包含了金属，木头或水晶，那么绝不能用在第十一层。
At the request of Nita Ambani, say the designers, if a metal, wood or crystal is part of the ninth-floor design, it shouldn’t be used on the eleventh floor, for example.
其他的说法是，这可能是云彩虹色，发生在水滴或水晶散射光芒的时候。
Others have also said it could have been cloud iridescence, which happens when water droplets or crystals scatter light.
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