semigroup
/'semɪɡruːp/ /ˌsɛmaɪɡrʊp/
n. 
群
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deltree, delubrum, delude, deluded, deluge, delusion, delusional, delusive, delusively, delusory,
相似单词
semiglobular, semigloss, semigovernmental, semi-granular, semigraphical, semigroup, semigymnovarian, semi-hand, semihard, semi-hardboard,