1、cornerstone[英][?k?n?st?n][美][?k?rn?rsto?n]n.奠基石; 基础; 最重要部份; 柱石; 复数：cornerstones例句:1.Usability has been a cornerstone of the social media revolution. 易用性一直是社交媒体革命的基石。
2、2.Of course, we all know that trust is the cornerstone of any relationship, whetherpersonal or organizational. 当然，大家都知道，无论是个人还是组织机构，信任都是一切关系的基石。
3、基础，基石。
