例如，从西班牙运输西红柿到英国的碳成本明显比在英国生产西红柿的碳成本要低，后者需要额外的加热和照明。
It is clear, for example, that the carbon cost of transporting tomatoes from Spain to the UK is less than that of producing them in the UK with additional heating and lighting.
由于有机发光二极管本身能通过电流使有机化合物发光，不需要背光照明，因此可以做得比液晶显示器更轻、更薄，更有柔韧性。
Because OLEDs do not need to be backlit-they get their lighting from organic compounds that emit light in response to electric current-they can be thinner, lighter and more flexible than LCDs.
豪特教授解释“因为鲨鱼在水下生存并且很多都喜欢在黄昏和拂晓活动，所以他们生活在相对比较昏暗的环境中。 就如人们在夜晚利用道路反射的光线照明一样，但有一些鲨鱼在一天所有的时间内活动且他们视网膜比一些夜间出没的肉食动物和深水动物拥有更多的视锥细胞和少量的棒形细胞”。
Dr Hart explained that, because sharks live underwater and many are most active at dawn and dusk, they are operating in relatively dim light.
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