地球绕轴自转，引起昼夜的变化。名词化结构。
The rotation of the earth on its own axis causes the change from day to night.
据卢卡说，海洋是种植植物的好地方，因为水下温度较为稳定，昼夜变化很小。
According to Luca, the sea is a good place to grow plants because underwater temperatures remain stable, changing little from day to night.
白天和黑夜被分为均等数量的部分，所以除去昼夜平分点，白天和黑夜时间是不等的；当然，这些时长也因季节变化而变化。
Day and night were divided into the same number of parts, so that except at the equinoxes, days and night hours were unequal; and then of course the length of these hours varied with the seasons.
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