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n.重点；要旨；基本原理；拱心石 变形： 复数：keystones 英英释义： keystone[ 'ki:stəun ]n.a central cohesive source of support and stability"the keystone of campaign reform was the ban on soft money"同义词：anchormainstaybackbonelinchpinlynchpinthe central building block at the top of
