词根词缀：ann-, anni-, annu-

【来源及含义】Latin: year, yearly

【同源单词】annalist, annals, anniversary, anno Domini, anno mundi, annual

词根词缀：semi-

【来源及含义】Latin: half, partly, twice

【同源单词】semi-acid, semi-amplexicaul, semiannual, semiannually, semiaquatic, semiarid