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（政策、讲话或想法的）要旨，主题，基调
The keynote of a policy, speech, or idea is the main theme of it or the part of it that is emphasized the most.
例句
He would be setting out his plans for the party in a keynote speech...
他将在其主旨发言中阐述他对该党的计划。
Responsibility and moderation were to be the keynotes of their foreign policy.
责任和克制将是他们外交政策的核心。