keystone
柯林斯詞典
1. N-COUNT A keystone of a policy, system, or process is an important part of it, which is the basis for later developments. 基礎(chǔ); 根本
The government's determination to beat inflation has so far been the keystone of its economic policy. 政府對通貨膨脹的堅決抑制迄今爲(wèi)止一直是其經(jīng)濟政策的根本。
2. N-COUNT A keystone is a stone at the top of an arch, which keeps the other stones in place by its weight and position. 拱頂石[技術(shù)]
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keystone /?ki??st??n/ (keystones)
劍橋詞典
keystone noun [C] (STONE)
architecture specializedthe middle stone in the top of an arch that has a special shape and holds all the other stones in position
拱頂石；塞縫石
keystone noun [C] (IMPORTANT PART)
the most important part of a plan , idea , etc. on which everything else depends
（計劃、想法等的）基礎(chǔ)，主旨，基本原則 返回 keystone