英 [ˈkiːstəʊn] 美 [ˈkiːstoʊn]
n. 基础，主旨；基本原则；楔石；拱顶石
复数keystones
keystone /ˈkiːˌstəʊn/
可数名词 A keystone of a policy, system, or process is an important part of it, which is the basis for later developments. 基础; 根本
The government's determination to beat inflation has so far been the keystone of its economic policy.
政府对通货膨胀的坚决抑制迄今为止一直是其经济政策的根本。
可数名词 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
启斯东电影公司
键石
... Keystone 启斯东电影公司 Kinetograph 爱迪生电影机 Last-Minute Rescue 最后关头救援 ...
...坛（ArchmagePodium）：.............................................................................18 拱心石（Keystone）：..
... key diamond 标色钻石 keystone 阶梯型变型 keystoneite 蓝硅孔雀石 ...
... keystoenscanning梯形扫描 keystone梯形畸变 keyway键槽 ...
That's what a keystone species does in an ecosystem.
那就是拱顶石物种在生态系统中的作用。
The government's determination to beat inflation has so far been the keystone of its economic policy.
政府对通货膨胀的坚决抑制迄今为止一直是其经济政策的根本。
It might seem that certain traits would clearly define a species as a keystone species.
似乎某些特征会清楚地将一个物种定义为关键物种。
Just as a keystone holds together a stone arch, Pennsylvania was seen as holding together the young American republic.
VOA : special.2009.08.23
The proposed Keystone XL pipeline would carry heavier crude oil produced from tar sands in Canada.
VOA : special.2011.07.08
Pennsylvania's nickname is the Keystone State.
VOA : special.2009.08.23
Thor's back-office organization has helped Keystone boost its once-struggling quality and service operation and spare-parts distribution.
Last week, the pro-Keystone House of Representatives voted to take the decision out of Obama's hands.
Mining for iron, copper, gold and coal is the keystone of the Western Australia economy.