1.cornerstone =basis or foundation(基础,基石)
2.常见词伙
2.1 对细节的专注is the cornerstone of success(是成功的基石)
2.2建筑,纪念碑要破土动工时,都会邀请一些知名人士来 lay the cornerstone for it(为它举行奠基仪式)
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