名词
中文翻译：关键石
同义词：
['cornerstone', 'cornerstone']
例句：
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1.The Keystone XL pipeline was a major project that would have transformed the oil industry.
Keystone XL管道是一个重大项目，本应改变石油行业。
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2.The construction of the new bridge is the keystone of the city's infrastructure development.
新桥梁的建设是该市基础设施发展的关键。
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3.The success of the project depended on the cooperation between the government and the private sector as the keystone of its development.
该项目的成功取决于政府与私营部门的合作，这是其发展的基石。