什么

what; whatever; wot; something; anything; everything; nothing (in negative statements); eh; pardon

基础

foundation; base; basis; foot; root; element; essential; cornerstone; stuff; ground; groundwork; infrastructure; fundamental; rudiments; backbone; baseline; substructure; footing; underpinning; handmaiden; basic; basal; core; elementary; underlying; rudimentary; elemental; fundamentally