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1939年—1940年,在世博会历史中,一株双生花绽放开来。这株双生花,一朵开在美国东岸的纽约,一朵在美国西岸的旧金山绽放。
1939 - 1940, in the history of the Expo, a twins bloom. This twins, a flower in New York on the east coast of the United States, bloom in San Francisco on the west coast of the United States.