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BNC: 21380 COCA: 17516
keystone
kstoʊn ˈkiˌstoʊn
Word forms: plural keystones
1 N-COUNT 拱顶石 A keystone is a stone at the top of an arch, which keeps the other stones in place by its weight and position. 拱顶石 [technical]
2 N-COUNT [usually singular] (政策、体系或进程的)基础,主旨 A keystone of a policy, system, or process is an important part of it, which is the basis for later developments. (政策、体系或进程的)基础,主旨
  • Keeping inflation low is the keystone of their economic policy. [+ of/in]

    将通货膨胀率保持在较低水平是他们经济政策的主旨。

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