Dr Hart explained that, because sharks live underwater and many are most active at dawn and dusk, they are operating in relatively dim light.

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”。

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The remaining rodents were also exposed to a cycle, but the dark was replaced with a dim glow equivalent to the twilight at the first flickers of dawn.

最后一组也同样在一个黑白交替的环境中，只不过晚上用昏暗的类似黄昏的灯光。

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The remaining rodents were also exposed to a cycle, but the dark was replaced with a dim glow equivalent to the twilight at the first flickers of dawn.

ECONOMIST: When��not just what��mice eat affects how fat they get