keystones 

  1. 名詞
keystone複數: 拱頂石, 拱心石
塞縫石
楔石, 冠石
美國賓州人
基本原則, 根本原理
要旨, 主旨
(計劃、想法等的)基礎

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

例句

  1. Ground floor windows have keystones .
  2. Like offset up to 6 keystones on same plate .
  3. The corbels and the keystones are made of stone.
  4. The keystones were adorned with heads of divinities.
  5. The obsolete Keystones were replaced by the Martin B-10 in 1937.