alternation of generation 基本例句 世代交替 Due to no alternation of generations,the medusoid phase being entirely suppressed.由于没有世代交替,水母阶段遭到完全抑制。 They show a heteromorphic alternation of generations, the gametophyte eging the dominant generation.苔藓植物具有明显的世代交替现象,配子体在世代交替中占优势。