pith
noun/pɪθ/
/pɪθ/
[uncountable]- a soft dry white substance inside the skin of oranges and some other fruits

enlarge image(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
Word OriginOld English pitha, of West Germanic origin.