人生被分为童年、成年和老年，谁也不能否认这是一个美妙的安排；一天中有清晨、正午和日落，一年要有四季之分，这样的安排才好。
No one can say that life with childhood, manhood and old age is not a beautiful arrangement; the day has its morning, noon and sunset, and the year has its seasons, and it is good that it is so.
不过对于禽类和猪来说，它们的流感季节是一年四季的。
与白昼和黑夜的时间长度密切相关的是一年中的四季变化，最明显的是夏季和冬季的差别。其原因是太阳的光照和温度在同时发生作用。
Intimately connected with the length of day and night are our seasons, especially summer and winter; for together with the sun's light heat is also called forth.
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