This story was originally featured on Fortune.com
此外，还有一点值得注意：清华毕业生出国比例在下降。
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中俄在战略上独立自主。我们始终尊重对方的核心利益，不把自己的意志和议程强加给对方，坚持不结盟、不对抗、不针对第三方。
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Now Postgres faces a dilemma. It can use the B-tree index on timestamp to get rows in the right timestamp order, but it has no way to skip directly to “US” rows. It must walk the index one entry at a time, checking the country for each row and discarding most of them. In the worst case, this means walking the entire index. Or it can scan rows that match severity