Keystone State

Keystone State

['ki:stəun steit]

n. 拱顶石州(宾夕法尼亚州的别称)

例句与用法：

The keystone in the crown of an arch.

拱顶石位于拱顶的塞缝石

A wooden frame built especially to support the sides of an arch until the keystone is positioned.

支拱板条专门用来在拱顶石放置好以前支撑拱的两边木架子

Belief in a life after death is the keystone of her religious faith.

她的宗教信仰的基础是相信死后有来生。

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ph.

【俚】拱顶石州(美国宾夕法尼亚州别名)