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VERB
崩溃；失败
If something such as a plan or system unravels, it breaks up or begins to fail.
例句
His government began to unravel because of a banking scandal...
他的政府由于一起金融丑闻而开始瓦解。
When she returned to America, the marriage unravelled.
她回到美国的时候，婚姻破裂了。
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V-ERG
解开；拆散；（使）松开
If you unravel something that is knotted, woven, or knitted, or if it unravels, it becomes one straight piece again or separates into its different threads.
例句
He was good with his hands and could unravel a knot or untangle yarn that others wouldn't even attempt...
他的手很灵巧，其他人甚至都不敢尝试的一些难解的绳结或缠在一起的纱线，他都能解开。
The stairway carpet is so frayed it threatens to unravel.
铺在楼梯上的地毯磨损得很厉害，都快散了。
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V-ERG
揭开；揭示
If you unravel a mystery or puzzle, or if it unravels, it gradually becomes clearer and you can work out the answer to it.
例句
A young mother has flown to Iceland to unravel the mystery of her husband's disappearance...
一位年轻的母亲飞抵冰岛，要揭开她丈夫失踪之谜。
Gradually, with an intelligent use of flashbacks, Yves' story unravels.
通过巧妙运用倒叙手法，伊夫的故事慢慢呈现出来。