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词根词缀:extra-, extro-, extr-, exter-

【来源及含义】Latin: beyond, outside, on the outside, outward, external

【同源单词】Ab extra, ad extra, ad extremum, exteriorly, external, external reforming

词根词缀:mur-

【来源及含义】Latin: wall

【同源单词】antemural, extramural, immure, immurement, intra muros, intramural