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cornerstones
The cornerstone of something is the basic part of it on which its existence, success, or truth depends.
keystone
Research is the cornerstone of the profession.
研究是该职业的基石。
雅思英语词汇收录8785个雅思英语词条，基本涵盖了全部常用雅思英语词汇的翻译及释义，是英语学习的有利工具。