科研之友
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<正>作为北美大陆最古老的山脉中的一支,大烟山不仅四季分明,而且24小时都有不同的美景:清晨的朦胧、午间的碧空和夜晚的萤火虫。"On top of old Smoky, all covered with snow." That is the first line of an American folk song associated with the Great Smoky Mountains. The breathtaking mountain range runs along the border of Tennessee and North Carolina.
