You have more hours of light in summer.

夏天日照时间更长。

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When kept in 12 hours of light and 12 hours of darkness the mice - which are nocturnal - began consuming more food when the lights were on as early as the first week.

研究人员将老鼠放在光照下12小时，黑暗中12小时。在有光照的情况下，老鼠(喜欢在夜间活动)开始摄入更多的食物，这种现象早在第一周就表现出来了。

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Plants that need more hours of darkness may only produce flowers under conditions that provide less light than darkness.

植物需要更长时间的黑暗可能的条件下才产生的花，提供不到光明与黑暗。

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Next time we will be more prepared -- with Federal funding, I could light up the whole of Southern Mississippi within 24 hours using a high-speed Internet connection.

CNN: 'In 24 hours we had reunited 11 families'