work along two lines at the same time 双管齐下

“双管齐下”，汉语成语，原指手握两支笔，同时作画（paint a picture with a brush in each hand at the same time），后比喻为达到某种目的，同时从两方面进行。可以翻译为“work along two lines at the same time”。

例句：

美国宇航局做了两手准备，两套策略双管齐下。

NASA is hedging its bets and adopting both strategies.