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to do everything necessary to be sure that something is successful
去做一切需要去做的以確保事情順利成功
A reference to baseball, in which the defensive players must make sure all bases (and baserunners who may occupy them) are accounted for.
源自棒球,防守隊員必須確保所有的壘包(以及可能占據(jù)壘包的跑壘員)都被計算在內(nèi)。

I think I’ve covered all the bases – I called everyone, ordered the food , and bought some decorations.
我想我已經(jīng)面面俱到,盡我所能了——我給每個人打了電話,定了餐,還買了一些裝飾品。