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Cuban officials have said on several occasions that they were open to dialogue with the U.S. as long as it was based on respect for Cuban sovereignty, but they have never confirmed that such talks were taking place.
，详情可参考新收录的资料
In 2020 China planted a flag on the Moon on its Chang'e-5 mission，推荐阅读新收录的资料获取更多信息
arr := [1, 2, 3, 4, 5];，更多细节参见新收录的资料