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BNC: 21380 COCA: 17516

keystone

1 ENTRIES FOUND:
keystone /ˈkiːˌstoʊn/ noun
plural keystones
keystone
/ˈkiːˌstoʊn/
noun
plural keystones
Learner's definition of KEYSTONE
[count]
: a large stone at the top of an arch that locks the other stones in place拱顶石;冠石
: something on which other things depend for support基础;主旨;基本原则

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