core

n. /kɔːr/ B2

核心；核心部分

The most central, important, or basic part of something.

仙境例句

At the core of the mushroom wood stood one great mushroom with a Caterpillar on top.

蘑菇林的中心立着一个大蘑菇，顶上坐着一条毛毛虫。