名词
中文翻译：关键石效应
同义词：
['Keystoneeffect', 'Keystone XL', 'Keystone pipeline']
例句：
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1. Thekeystone effect of this policy is toreduce carbon emissions.
这项政策的关键石效应是减少碳排放。
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2. The Keystone XLpipeline was a controversial project that had thepotential to significantly impact the oil industry.
Keystone XL管道是一个有争议的项目，可能会对石油行业产生重大影响。
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3.The construction of the Keystone pipeline hasbeen a topic of debate in the UnitedStates for years.
Keystone管道的建设多年来一直是美国的一个争论话题。