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国际新闻
Bosnia votes in one of world’s most complicated general elections
Voters cast their ballots for a dizzying number of officials across multiple tiers of government.
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科学与环境
NASA's Perseverance Mars rover finds groundwater, lakes, and hot fluids in one place
NASA’s Perseverance rover has uncovered a surprisingly complicated history of water in Jezero Crater. Scientists expected the crater’s Margin Unit to contain lake sediments, but instead found ancient igneous rocks that were altered by water on at least three separate occasions.
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