MongoDB | PostgreSQL
Selection effect: People who work weekends are often more experienced contributors doing careful, thoughtful work. They introduce fewer bugs per commit.，这一点在谷歌浏览器下载中也有详细论述
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比如，一些小的国家，汇率降得很多。新希望遇到过很多次，一年降30%、40%，甚至50%。，更多细节参见体育直播
3. The pay is lower