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1.lurk 潜伏；潜藏
Hidden dangers lurk in every family home.
每个家庭都存在潜伏的危险。
2.surge 剧增
Specialists see various reasons for the recent surge in inflation.
专家认为最近通货膨胀加剧有各种原因。
3.crack down 严厉打击
The government has cracked down hard on those campaigning for greater democracy.
政府严厉打击了那些争取更多民主的人。
4.run-up 前夕
The company believes the products will sell well in the run-up to Christmas.
该公司相信这些产品在圣诞节前夕将会销得很好。
