1. 核心群：core 果心 | core group 核心群 | core transplantation of silkworm 蚕核移植

2. 核心詞群：copying transformation 複寫變形 | core group 核心詞群 | coreference 指稱相同;指涉相同

3. 核心词群(大类中的小类)：core gripper || 芯夹 | core group || 核心词群(大类中的小类) | core hardness tester || 砂芯硬度计

noun

1. a small group of indispensable persons or things

    e.g. five periodicals make up the core of their publishing program

    Synonym: corenucleus