Why did the United Nations set up the International Day of Happiness?

为什么联合国要设立国际幸福日？

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Q: When did Earth Day move from the United States to nations around the world?

问：地球日什么时候开始从美国走向世界各国？

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When did Earth Day move from the United States to nations around the world?

地球日什么时候开始从美国走向世界各国？

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When did Earth Day move from the United States to nations around the world?

地球日什么时候开始从美国走向世界各国？

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