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