名词
中文翻译：关键石袋
同义词：
['keystone structure', 'keystone arrangement', 'keystone design']
例句：
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1. The keystone of the new building is its central atrium.
这座新建筑的关键在于其中央大厅。
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2. The keystone of the project was the collaboration between the two teams.
该项目的关键因素是两个团队之间的合作。
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3.The keystone of the economy is innovation and entrepreneurship.
经济的关键是创新和创业。