Keystone
例子
The Renaissance bridge featured a carved keystone depicting a mythological figure, serving as a focal point of the design.
文艺复兴时期的桥梁有一个雕刻的拱顶石，描绘了一个神话人物，作为设计的焦点。
02
a central element or factor that provides essential support or cohesion to a system or concept
例子
Renewable energy is the keystone of the city's sustainability plan.
词汇树
keystone
key
stone
