essential

a.根本的；必要的 n.(pl.)本质，要点

ESP, espadrille, espalier, especial, especially, Esperanto, espionage, espionage(title), esplanade, espousal, espouse, espresso, esprit, esprit de corps, espy, Esq, Esquire, essay, essayist, essence, essential oil, essentially, EST, est (also estd), establish, established, establishment, estate, estd, esteem, esteemed, esthete, esthetic, esthetic, estimable, estimate, estimation, estrange, estranged, estrangement, estuary,