cornerstone
英 ['k??n?st??n]
美['k?rn?ston]
- n. 基礎；柱石；地基
考試真題
- sustainable way is the cornerstone (基石) of our nation's energy security, and will be one of the major challengesof the 21st century.
出自-2011年12月閱讀原文
- The college students had cultivated the ability to ask questions, the cornerstone of critical thinking.
出自-2015年12月閱讀原文