...坛（ArchmagePodium）：.............................................................................18 拱心石（Keystone）：..
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keystone species 关键种 ; 关键物种 ; 基石物种
Keystone XL 基石XL ; 拱心石XL ; 基石输油管计划 ; 输油管线
keystone distortion [电子] 梯形失真 ; [电子] 梯形畸变 ; 梯形失真校正
Keystone State 拱心石之州 ; 基石州 ; 拱顶石州 ; 基本原理
Keystone XL pipeline 输油管道 ; 项目 ; 输油管 ; 输油管道项目
keystone fault 拱楔断层 ; 穹顶断层
Keystone Correction 梯形失真调节 ; 梯形失真校正 ; 梯形修正
keystone cut 梯形割缝
N-COUNT 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。
N-COUNT 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 [技术]
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
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