Keystone
[ ['ki:stəun] ]
大学 College
n. 拱顶石, 楔石, 重点
✅ 同义词
📖 牛津释义
keystone
n
1 (architecture 建) central stone at the top of an arch locking the others into position 拱顶石.
2 (usu sing 通常作单数) (fig 比喻) most important part of a plan, an argument, etc on which all the other parts depend （计划、 论据等的）基础, 主旨
Belief in a life after death is the keystone of her religious faith. 她的宗教信仰的基础是相信死後有来生. Cf 参看 corner-stone (corner1).
🗣️ 情景例句
OK. Let's pick up the pace.
好 把节奏加快一些。
Oh, thank you.
噢，谢谢了。
If there had not been a hard layer of rock beneath the soil, they would have completed the job in a few hours.
如果不是因为土壤下面有一层坚硬的岩石，他们的营救工作仅用几个小时就可以完成了。