diversity time分集时间diversityn.多样性；差异diversity of learning effects英语教学diversity reception technique分集接收技术diversity of urban conditions城市多样性diversity interconnection link分集互连链路diversity-retaining operator多样性保持算子diversity reception techniques分集接收技术diversity maintenance strategy多样性保持策略diversity of military missions多样化军事任务diversity maintaining mechanism多样性维持机制diversity of microbial community微生物群落功能多样性