ETG视丘电图ETabbr.东部时间（=Eastern Time)abbr.外星人（=extraterrestrial）Ethnologic region民族地区ethyl phenyl urea乙基·苯基脲ethological study习性学研究ethoxynaphthalene[化] 乙氧萘ethyl acetimidate乙酰亚胺酸乙酯ethnographic film民族志影片ethylidene iodide亚乙基二碘ethyl-dipeterexn.乙基敌百虫ethyl ricinoleate蓖麻酸乙酯ethylidene glycol亚乙基二醇