距离上次央行降准降息不到2个月时间，“双降”大招被再度祭出。请看本报昨日的报道：

    China’s central bank cut interest rates and lowered the amount of reserves banks must hold for the second time in two months Tuesday, ratcheting up support for a stuttering economy and a plunging stock market.

    The move came as Chinese stock indexes nosedived more than 7 percent Tuesday to hit troughs not seen since December, and after shares had plunged over 8 percent Monday.

    The latest policy easing also followed a shock devaluation in the yuan two weeks ago.

    报道中的ratchet up就是“增加、逐渐提高”。请看例句：

    Buying more treasuries would impact yields, while moving into corporate bonds would ratchet up risk.

    购买更多国债将影响收益，而购买公司债券则会增加风险。