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.
昼夜长短之类的自然变化是如何对野生动物产生如此深刻的生理变化及行为变化呢？
How do natural variations such as the changing day length make such profound alterations to physiology and behaviour?
就是这样的倾斜角度才使我们有四个季节。有昼夜长短的变化。
It is this tilting that accounts for our four seasons and the lengthening and shortening of days and nights.
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