keystone
US /ˈkiː.stoʊn/
UK /ˈkiː.stoʊn/
名詞
1.
拱心石, 主石
a central stone at the summit of an arch, locking the whole together
範例:
•
The architect carefully placed the keystone to complete the arch.
建築師小心翼翼地放置了拱心石以完成拱門。
•
Without the keystone, the entire structure would collapse.
沒有拱心石，整個結構就會坍塌。
2.
基石, 核心
the central principle or part of a policy, system, etc., on which all others depend
範例:
•
Education is the keystone of a prosperous society.
教育是繁榮社會的基石。
•
The new policy is the keystone of their economic reform.
新政策是他們經濟改革的基石。
在 Lingoland 學習這個單詞