pith
noun /pɪθ/
/pɪθ/
[uncountable]- enlarge imagea soft dry white substance inside the skin of oranges and some other fruits
（橙子等水果中的）中果皮 - the essential or most important part of something
精髓；核心；要点 - the pith of her argument
她论据的核心
- the pith of her argument
词源Old English pitha, of West Germanic origin.