ETIn.已过时间指示器ETabbr.东部时间（=Eastern Time)abbr.外星人（=extraterrestrial）ethnosociology民族社会学ethyl peroxide过氧乙醚ethoxycarbonyl乙酯基ethyl aldehyde(增香剂) 乙醛ethane diamine乙二胺ethyl fumarate反-丁烯二酸乙酯Etype graphite晶间石墨Ethylend oxide环氧乙烷ethyl coumarin乙基香豆素ethyl linalool乙基芳樟醇