Level 6 · word 16,500 of 20,000
keystone
/ˈkiːˌstoʊn/
American
- n. 拱顶石
- n. 关键
- Definition
- n. the central stone that holds an arch together
- n. the most important part of something
- Example
- Trust is the keystone of any strong and lasting friendship.
- 信任是任何牢固持久的友谊的基石。
Word mapBuilding parts