| 单词 | cornerstone |
| 释义 | Word Frequency cornerstone(ˈkɔːnəˌstəʊn) noun 1. a stone at the corner of a wall, uniting two intersecting walls; quoin 2. a stone placed at the corner of a building during a ceremony to mark the start of construction 3. a person or thing of prime importance; basis the cornerstone of the whole argument |
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