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BNC: 21380 COCA: 17516

keystone noun [ C ] STONE

specialized architecture the middle stone in the top of an arch that has a special shape and holds all the other stones in position拱顶石;塞缝石

keystone noun [ C ] IMPORTANT PART

the most important part of a plan, idea, etc. on which everything else depends(计划、想法等的)基础,主旨,基本原则


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