keystone 

  1. 名詞
拱頂石, 拱心石
塞縫石
楔石, 冠石
美國賓州人
通常為單數可數名詞:
基本原則, 根本原理
要旨, 主旨
(計劃、想法等的)基礎
/此名詞複數為"keystones"/

    同義字詞
base,basis,bedrock,bottom,cornerstone,footing,foundation,ground,groundwork,root,underpinning,warp,warp and woof

  2. 形容詞
吉斯通式的

    
                        
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例句

                

                    
    
                                                    
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                                Keystone has become a political issue.                            
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                                At a book reading at Borders in Keystone .                            
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                                The Keystone XL extension was proposed in 2008.                            
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                                The Keystone Cops it was, or was it Buster Keaton?                            
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                                Architecture The keystone in the crown of an arch.                            
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