文字游戏，每次FOMC出来，都有程序来diff一下关键词，
尤其是这句的变化
that it likely will be appropriate to maintain the current target range for
the federal funds rate for a <> after the asset purchase
program ends,
但是2YR的市场反应无从知晓。 好久没关注，不知道现在这种no to little surprise
的情况下，市场貌似一般是dump then pump then dump to unchanged.
