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1、step up
增加(数量等);提高(速度、强度等)
He urged donors to step up their efforts to send aid to Somalia.
他敦促各捐赠方加快速度将援助物资送往索马里。
Security is being stepped up to deal with the increase in violence.
正在加强安保工作以应对日益增多的暴力活动。
2、bring down
使（政府或当权者）垮台
They were threatening to bring down the government by withdrawing from the ruling coalition.
他们威胁要退出执政联盟，让政府垮台。
His challenge to Mrs Thatcher brought her down.
他的挑战导致了撒切尔夫人的下台。
射落；击落；击倒
Military historians may never know what brought down the jet.
军事史学家们可能永远也不会知道是什么击落了这架喷气式飞机。
3、hunt down
追捕到，穷追直至找到（罪犯、敌人等）
Last December they hunted down and killed one of the gangsters.
去年12月他们追捕到其中一名匪徒并将其击毙。
Those who do not come forward should be hunted down.
对于那些不肯自首的罪犯应予缉拿归案。
4、establish
建立;创立;设立；制定
The UN has established detailed criteria for who should be allowed to vote.
联合国已经制定了有关投票资格的标准细则。
The School was established in 1989 by an Italian professor.
这所学院由一名意大利教授于1989年创建。
建立，开始（联系）
We had already established contact with the museum.
我们已经和那家博物馆建立了联系。
Singapore and South Africa have established diplomatic relations.
新加坡和南非已经建立了外交关系。
确定;查实;证实
Medical tests established that she was not their own child.
医学化验证实她不是他们的亲骨肉。
It will be essential to establish how the money is being spent.
查清楚这笔钱将作何用途至关重要。
