第四步：实践与提高
　　补充练习：将下列句子翻成汉语，注意总结句子结构。
　　1. Whereas other societies look to the past for guidance, we cast our nets forward.（面向未来）
　　2. It is the belief in a brighter future that gives us optimism.
　　3. Even these days, when not all progress seems positive (nuclear weapons, air pollution, unemployment, etc.), the belief remains that for every problem there is a rational solution.
　　4. The job of parents is to give children every opportunity while they are growing up and then get out of their way.
　　5. What deference people in authority do command is based on their actual powers rather than on their age, wisdom, or dignity.

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