基本词汇
n.拱顶石；基础；重点
详情解释
英英释义
"faith is his anchor"
"the keystone of campaign reform was the ban on soft money"
"he is the linchpin of this firm"
经典引文
The Third Reich..would have as its keystone the conception of the people and the national idea.
出自：Times近义词
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