1. Occurring without periodicity; irregular. 
   无周期性发生的；不规则的
2. (biology) exhibiting 24-hour periodicity. 
   （生物学）显示出24小时的周期。
3. Relating to or exhibiting approximately24-hour periodicity. 
   昼夜节律的，24小时的与24小时周期相关或大约每24小时周期出现的
4. the Ptolemaic system with its built-in concept of periodicity; a constitutional inability to tell the truth. 
   托勒密之天动学说及其内部的周期定律；生来爱撒谎的毛病。
5. Crisis intervention; crisis planning. 
   危机调停；决定性部署

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