ephemera

n [pl] things that are used, enjoyed, etc for only a short time and then forgotten 只可短期使用、 享受等的事物.

envenom, enviable, enviably, envious, enviously, environment, environmental, environmentalist, environmentally, environs, envisage, envision, envoy, envy, enzyme, eon, EP, epaulet, epaulette (also esp US epaulet), epee, ephemeral, epic, epicentre (US epicenter), epicure, epicurean, epidemic, epidermis, epidural, epiglottal, epiglottis, epigram, epigrammatic, epilepsy, epileptic, epilogue, Epiphany, episcopal, episcopalian, episiotomy, episode,