intrinsic
adjective uk/ɪnˈtrɪn.zɪk/ us/ɪnˈtrɪn.zɪk/
C2 固有的，本质的，根本的
being an extremely important and basic characteristic of a person or thing
works of little intrinsic value/interest 本身无甚价值／趣味的作品
Maths is an intrinsic part of the school curriculum. 数学是中小学校的基础课。