She was scouring for signs of something positive, anything that would offer a ray of hope or light for her situation.

她在搜寻一些正面的信息，任何能使她的处境变回希望和光明的东西。

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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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Conclusion: Marrow morphology and X-ray were good methods for diagnosis of NB, B ultrasonic and CT can improve positive incidence.

结论：骨髓细胞形态学和X线检查是诊断nb的较好方法，B超、CT可提高肿瘤检出率。

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Man Ray in the 1920s used solarisation, which gives photographs negative and positive characteristics, a perfect technique for a surrealist.

ECONOMIST: Snapping up the past

Dedicated to creating "inspirational ... films that offer compelling, positive messages, " Crusader's first film will be something called Sound of Thunder, based on a Ray Bradbury short story about a posse of big-game hunters who go back in time to chase dinosaurs and change history.

FORBES: Morality Play