建筑学中，拱道或门口的拱心石，是把建筑整体连接在一起来防止它倒塌的石头。
In architecture, a keystone in an archway or doorway is the stone that holds the whole thing together, and keeps it from collapsing.
这是拱心石吗？
但有一个人一如既往地稳定，成为支撑桥梁的拱心石——他就是维迪奇。
But if there's been one constant, the keystone holding up the bridge, it's Vidic.
计划中的大号拱心石石油管道将用于运输产自加拿大油沙的重原油。
The proposed Keystone XL pipeline would carry heavier crude oil produced from tar sands in Canada.
我当时就在想方设法向你们伸出援手，不管怎样，拱心石最后还是来到了维莱特庄园。
I was formulating a plan to extend you a helping hand. One way or another, the keystone was coming to Chateau Villette.
拱心石之州在化石燃料燃烧产生CO2上排名48，可吸入颗粒排名49，毒素暴露位居49。
The "Keystone State" ranks 48th in CO2 emissions from fossil fuel combustion, 49th for particulates in the air, and 49th for toxic exposure.
“大号拱心石”不仅能够将更多的加拿大石油输往美国，通过墨西哥湾的港口终端，还可以将焦油砂与国际市场连在一起。
Keystone XL would not only take more Canadian oil to America; via terminals on the Gulf of Mexico it could connect the tar sands with international markets as well.
宾夕法尼亚州的别名是“拱心石之州”。就如拱心石支撑起石拱一样，人们认为宾夕法尼亚支撑起了年轻的美利坚共和国。
Pennsylvania's nickname is the keystone State. Just as a keystone holds together a stone arch, Pennsylvania was seen as holding together the young American republic.
2012年拱心石艾滋病毒疫苗的专题讨论会会议将侧重于基本的免疫学和HIV - 1病毒学方面的突出问题，挑战该领域。
The 2012 Keystone Symposia meeting on HIV Vaccines will focus on basic aspects of immunology and HIV-1 virology to highlight issues that challenge the field.
自由之所以居于至高无上的核心地位，是因为它是“开启崇高的实践原理的钥匙，它是纯粹的、甚至思辨理性体系的整个建筑的拱心石。”
Freedom be in the supreme core status, because it is "the opening lofty practice principle key, it is pure, even speculates the rational system entire construction head."
与此同时，卡尔加里的石油商们正心急如焚地等待着修建一条通往太平洋，实际上就是通往亚洲的输油管线尽快开工，而且越快越好。如果“大号拱心石”管线工程受阻就更是如此了。
Meanwhile in Calgary, oilmen expect a pipeline to the Pacific, and in effect to Asia, to come sooner than later, especially if Keystone XL is blocked.
与此同时，卡尔加里的石油商们正心急如焚地等待着修建一条通往太平洋，实际上就是通往亚洲的输油管线尽快开工，而且越快越好。如果“大号拱心石”管线工程受阻就更是如此了。
Meanwhile in Calgary, oilmen expect a pipeline to the Pacific, and in effect to Asia, to come sooner than later, especially if Keystone XL is blocked.
应用推荐