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单词 ED
释义
ED
noun [ U ] medical specialized uk/ˌiː ˈdiː/ us/ˌiː ˈdiː/
勃起机能障碍,勃起无力(erectile dysfunction的缩写)
abbreviation for erectile dysfunction
有效剂量(effective dose的缩写)
abbreviation for effective dose: the amount of a drug that produces the effect that is wanted
-ed
suffix (also -d) uk/ -t/ /-d/ /-ɪd/ /-əd/ us/ -t/ /-d/ /-ɪd/ /-əd/
(用于构成规则动词的过去式和过去分词)
used to form the past simple and past participle of regular verbs
called
asked looked
looked
started 开始
played
returned 回来
worked 工作
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