他们白天睡觉，夜晚捕猎。

They sleep by day and hunt by night.

《牛津词典》

白天越来越长，夜晚越来越短。

The day's getting longer and the night's getting shorter.

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在大约10万年的时间里，当海水退去，世界各地的气候变得更加极端：白天更暖和，夜晚更凉爽；夏天更热，冬天更冷。

Over a period of about 100,000 years, while the seas pulled back, climates around the world became dramatically more extreme: warmer days, cooler nights; hotter summers, colder winters.

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