cor·ner·stone
noun/ˈkɔːnəstəʊn/
/ˈkɔːrnərstəʊn/
- a stone at the corner of the base of a building, often laid in a special ceremony
基石；奠基石 - 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。
- This study is the cornerstone of the whole research programme.