While some may choose a simple sheath of light materials, perhaps the ideal choice for a bridal gown on the beach will be one with a design rule.
于是有人会选择轻质材料的女士紧身衣，也许是在海滩上新娘礼服的理想选择将会有一定的设计规则。
Dr Hess envisages a ray of light travelling down an optical fibre made from two materials: a core with a negative refractive index and an outer sheath with a positive one.
赫斯博士构想出一个画面，即一道光正穿越于一个由两种材料制作的光导纤维，一种是具有正折射指数的纤维核，另一种则是具有正折射指数的外围。
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