1、It took them all day to break the back of the job.
他們干了一整天才把工作的最主要部分完成了。

2、Defeat in North Carolina seemed to break the back of the entire fundamentalist crusade.
在北卡羅來納的失敗，似乎使整個原教旨主義運(yùn)動再也無能為力了。

3、We are casting about how to break the back of the work.
我們正在考慮怎樣完成這件工作的最艱巨部分。

4、I should break the back of this piece of the work by this weekend.
到這個周末我應(yīng)該完成這件工作中最艱巨的部分。