1. roll back 恢復；倒退
Obama has said he would roll back some of Bush's tax cuts for the wealthy in the longer term.
奧巴馬表示，會在較長期間內恢復徵收布什政府對富有階層減少的稅收W]@ZGlrdfjoqUv=%。

2. account for 占（到了多大比例）
But the original Coke is still at the heart of the company's operations, accounting for 70 percent of all its soft drink unit sales.
但是最初的可樂仍然是公司運營和發展的中心部分，可口可樂的銷量占其整個軟飲料銷售量的70%%nu^f)2_mJAzFT7q。

3. tit-for-tat 針鋒相對的；以牙還牙的
A gang of drug dealers wanted to punish a rival gang for shooting their leader. That led to a tit-for-tat series of murders, kidnappings and arsons.
一個販毒團伙的頭目被對立的幫派槍殺了，這個團伙于是展開報復，導致雙方以牙還牙的交惡，從謀殺、綁架到縱火，無所不為|2|yTc4Tq~(。

4. round-the-clock 24小時的
He's very sick and needs round-the-clock care.
他病得很重，得一直照顧著x(D]DGZOhJD。