keystone
n
1 (architecture 建) central stone at the top of an arch locking the others into position 拱頂石.
2 (usu sing 通常作單數(shù)) (fig 比喻) most important part of a plan, an argument, etc on which all the other parts depend (計(jì)劃、 論據(jù)等的)基礎(chǔ), 主旨
Belief in a life after death is the keystone of her religious faith. 她的宗教信仰的基礎(chǔ)是相信死後有來生. Cf 參看 corner-stone (corner1).
??? 情景例句
This method should be widely promoted.
這種方法應(yīng)該推廣。
They must hunger in frost that will not work in heat.