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When the "energy crisis" first came in 1973-1974, I was living with my family in a cabin on the edge of an area where deer spend the winter in northern Minnesota, observing the deer as their behavior changed from more activity in summer and fall to less as winter progressed, followed by an increase again in the spring as the snow melted. It was interesting and rather amusing to listen to the advice given on the radio:
1973-1974年间，第一次出现"能源危机"的时候，我正与家人住在明尼苏达州北部一处鹿群过冬地方的边缘地带。我们住在一个小屋里，观察鹿的生活习性，观察它们是如何随着冬季来临从夏秋的活动频繁状态而变得少动的，而到春暖雪融时，他们的活动又是如何增多起来的。当时广播电台常告诫我们:
" Drive only when necessary," we were told. "Put on more clothes to stay warm, and turn the thermostat on your furnace down." Meanwhile we watched the deer reduce their activity, grow a winter coat of hair, and reduce their metabolism as they have for thousands of years.It is biologically reasonable for deer to reduce their cost of living to increase their chances of surviving in winter.
"没有必要不开车，""多穿衣服好保暖，并请调低锅炉上的恒温器。"这些话听起来既有趣又逗笑。因为与此同时，我们一直注视着鹿减少活动，长出越冬的厚毛，并减缓新陈代谢。几千年来，他们一贯如此。鹿减少生存所需的能耗以增加越冬生存的机会，从生物学角度来看是合情合理的。
Not every winter is critical for deer of course. If the winter has light snow, survival and productivity next spring will be high. But if deep snows come and the weather remains cold for several weeks, then the deer must spend more energy to move about, food will be harder to find, and they must then depend more on their fat reserves to pull them through. If such conditions go on for too long some will die, and only the largest and strongest are likely to survive. That is a fundamental rule of life for wild, free wandering animal such as deer.
当然，对鹿来讲，并非每个冬天都处于危难之中。如果冬天雪下得少，存活率和次年春天的繁殖力就高。但如果雪积得深，天气连续数周寒冷，鹿活动起来就得花费较多的能量，觅食会更难，这时它们就得更多地依赖其脂肪储备度过寒冬。如果这种情况持续太久，有些鹿就要死亡，只有体型最大最壮的，才有可能存活。对于像鹿这样四处自由奔走的野生动物来说，这是一条根本的生存规律。
Yes, life - and death, too - is a cycle that goes round and round, and when animals die their bodies become food for other life forms to use by converting them into energy.
的确，生命-还有死亡-周而复始，循环不已。当动物死亡的时候，他们的尸体转化为能量，变成食物，供其他生命形式使用。
And the cycle continues.
如此循环，永不止息。
