喉咙发痒、鼻塞和身体疼痛都会带来痛苦，但若能分辨出是感冒还是流感导致的，就可能改变痛苦持续的时间。

Scratchy throats, stuffy noses and body aches all spell misery, but being able to tell if the cause is a cold or flu may make a difference in how long the misery lasts.

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这些时段被称为“日光时”，因为它们的持续时间随着不同季节而带来的昼夜长短的变化而改变。

These periods became known as temporal hours, because their duration varied according to the changing length of days and nights with the passing of the seasons.

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我们用一代人时间就可以带来改变。

We can bring change in one generation.

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