y13 https://paragraph.com/@y13 undefined Tue, 19 May 2026 17:39:55 GMT https://validator.w3.org/feed/docs/rss2.html https://github.com/jpmonette/feed en All rights reserved <![CDATA[day day up]]> https://paragraph.com/@y13/day-day-up V48oWMc29r2NgxUbO6p2 Sun, 28 Aug 2022 08:12:11 GMT 3）保持贪婪：在1/2的前提下尽可能多赚钱，即更高的卖价/更低的买价。

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