This assignment should be no more than one to two pages in length and should briefly summarize each of the three lessons.
作业长度以不超过一到二页为准，而且应该将三堂课的内容加以摘要。
Two extra and ultra power system in the western and eastern parts of North America are similar to future China national power system, so their experience and lessons are more useful to us.
北美东、西部两个特大型和超大型电力系统从多方面都和中国未来全国电力系统相近，故其经验和教训皆具参考价值。
Two extra and ultra power system in the western and eastern parts of North America are similar to future China national power system, so their experience and lessons are more useful to us.
北美东、西部两个特大型和超大型电力系统从多方面都和中国未来全国电力系统相近，故其经验和教训皆具参考价值。
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