1. roll back 恢复；倒退
Obama has said he would roll back some of Bush's tax cuts for the wealthy in the longer term.
奥巴马表示，会在较长期间内恢复徵收布什政府对富有阶层减少的税收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.
但是最初的可乐仍然是公司运营和发展的中心部分，可口可乐的销量占其整个软饮料销售量的70%%nu^f)2_mJAzFT7q。

3. tit-for-tat 针锋相对的；以牙还牙的
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.
一个贩毒团伙的头目被对立的帮派枪杀了，这个团伙于是展开报复，导致双方以牙还牙的交恶，从谋杀、绑架到纵火，无所不为|2|yTc4Tq~(。

4. round-the-clock 24小时的
He's very sick and needs round-the-clock care.
他病得很重，得一直照顾着x(D]DGZOhJD。