—就会增加，这一增加就会导致食物短缺，很多小动物就会死亡。倘若这些小动物数量减少了，接下来就会减少了供应给北极狐和北极狼的食物。这样下来，由于某一物种的数量的改变，就有可能影响到整个食物链的脱节。

　　Until recently， the changing seasons on the tundra were seen only by a few Eskimo hunters and explorers. What would draw men and women to live in such a hostile land？ The answer is oil.

　　译：不久前，只有极少数的爱斯基摩的猎手和探险家才能深究到冻土带上的寒来暑往，冬去春来。那么，是什么东西把男男女女都吸引到这块环境十分恶劣的土地上来的呢？答案就是：石油。

　　9.draw （v.）： attract 吸引

　　In 1968， oil was discovered beneath the frozen soil on Alaska's Northern Slope. Now an 800-mile （about 1300 kilometers） pipeline has been built from Prudhoe Bay on the Arctic Ocean to Valdes， a port on the south coast of Alaska.

　　译：1968年在阿拉斯加北边坡地的冻土下面发现了石油。现在已经把一条800英里长的输油管从北冰洋上的普拉德霍湾架设到了阿拉斯加南岸的港口城市瓦尔迪兹。

　　The pipeline carries the oil from the Northern Slope， across the tundra， to the port. From there， it is shipped to the rest of the United States.

　　译：这条输油管把石油从北部坡地，越过冻土带，输送到瓦尔迪兹港口，又从那里把石油装船运送到美国其它地方。

　　10.ship （v.） 运送，输送

　　Thousands of men and women were needed to build and maintain the pipeline. For the first time， large numbers of people were brought into contact with the tundra.

　　译：为了修建和维护这条输油管，成千上万的男女需要参与工作。这是破天荒第一次，把一大批又一大批的人送到这里来与冻土带打交道。

　　Their presence and the presence of the pipeline they built represented a major change in the environment. How will the life cycles of the tundra be affected？

　　译：这些人的到来以及他们所修建的输油管的出现标志着冻土带的环境的重大改变。那么，冻土带的生活周期会受到什么影响呢？

　　The survival of the United States depends on the ability to find new sources of energy. Oil from beneath the tundra is very important to the nations' development. But the survival of the tundra depends on how carefully people maintain the delicate balance of nature in this environment.

　　译：美国能否继续生存下去，依赖于是否有能力找到新的能源。来自冻土带下面的石油对美国的发展至关重要。但是，这块冻土带上的一切是否能继续维持下去，依赖于人们是否能细心地维护这种环境下大自然里各个物种之间的平衡。

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