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cornerstone

noun
🔊/ˈkɔːnəstəʊn/
🔊/ˈkɔːrnərstəʊn/
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  1. a stone at the corner of the base of a building, often laid in a special ceremony基石；奠基石
  2. the most important part of something that the rest depends on最重要部分；基础；柱石
    • This study is the cornerstone of the whole research programme.此项研究是整个研究计划的基础。🔊🔊