keystone
US /ˈkiː.stoʊn/
UK /ˈkiː.stoʊn/
名词
1.
拱心石, 主石
a central stone at the summit of an arch, locking the whole together
示例:
•
The architect carefully placed the keystone to complete the arch.
建筑师小心翼翼地放置了拱心石以完成拱门。
•
Without the keystone, the entire structure would collapse.
没有拱心石，整个结构就会坍塌。
2.
基石, 核心
the central principle or part of a policy, system, etc., on which all others depend
示例:
•
Education is the keystone of a prosperous society.
教育是繁荣社会的基石。
•
The new policy is the keystone of their economic reform.
新政策是他们经济改革的基石。
在 Lingoland 学习这个单词