如果水具有负折射率，那么放在玻璃杯中的吸管似乎可能弯曲到自身下方。
If water had a negative index of refraction, then a straw placed in a glass would appear to bend back under itself.
这种作用解释了为什么看起来玻璃杯中的吸管在水面处弯曲。
This effect explains why a straw in a glass of water appears to bend at the surface of the water.
在这些商店的外面，34岁de Ann Kimeu，用吸管喝了一小口绿色的玻璃瓶里的雪碧。
Outside one of those shops, Ann Kimeu, 34, sips Sprite through a straw from a green glass bottle.
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