求翻译：。"山姆大叔"勤劳开朗的性格和爱国热忱，体现了美国人民的天性和精神。因此，1961年，美国国会正式承认"山姆大叔"为美国的民族象征和代表。是什么意思？

. "Uncle Sam" hard-working, cheerful personality and patriotism, embodies the spirit of the American people and nature. Thus, in 1961, the U.S. Congress officially recognized "Uncle Sam" for the U.S. national symbol and representation.

. "Uncle Sam" industrious and cheerful temperament and patriotism, an embodiment of the American people and the spirit of nature. Thus, in 1961, the United States Congress officially recognized "Uncle Sam" for the United States' national symbol and representative.

.“Uncle Sam " industrious open and bright disposition and patriotic zealous, has manifested the American people's instinct and the spirit.Therefore, in 1961, United States Congress acknowledged officially " Uncle Sam " is US's national symbol and representative.

。 "Uncle Sam" industrious, cheerful character and patriotism, embodied United States nature and spirit of the people. Therefore, in 1961, the United States Congress formally recognized the "Uncle Sam" for the United States national symbols and representatives.

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