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   1. Eskimos use refrigerators to keep food from freezing.爱斯基摩人用冰箱防止食物结冰。

　　2. Astronauts circling the Earth may get to see sixteen sunrises and sixteen sunsets every “day”. 环绕地球飞行的宇航员每 “天”可以看见16次日出和16次日落。

　　3. Migrating wild geese fly in a V formation to save energy. A goose's wings churn the air and leave an air current behind. In the flying wedge, each bird is in position to get a lift from the current left by the bird ahead. It is easier going for all, except the leader. During a migration, geese are apt to take turns in the leading position. 迁徙中的大雁群成V字队形飞是为了节省能量。一只大雁的翅膀扇动空气，在身后留下一股气流。在飞行的楔行队列中，每一只大雁都得到前面的大雁产生的气流的升力。这样，除了领队以外，所有的大雁飞起来都省力些。一次迁徙飞行中往往有几只大雁轮流领飞。

　　4. Pollen never deteriorates. It is one of the few naturally secreted substances that last indefinitely. 花粉永远不会变质，是自然界中少有的几种可以无限期存在的物质之一。

　　5. There's enough energy in ten minutes of one hurricane to match the nuclear stockpiles of the world. 飓风十分钟的能量足以比得上全世界储存的核武器的能量。

　　6. A whale's heart beats only nine times a minute. 鲸的心脏每分钟只搏动9次。

　　7. The lungfish can live out of water in a state of suspended animation for three years.肺鱼离水后以暂不活动的状态可存活3年。

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