1.  unscheduled
2.  nonsked
3.  nonscheduled
4.  aperiodic
5.  casual

• 1. 回程不定期的双程票: Open return
• 2. 不定期的活动: irregularly scheduled activities
• 3. 不定期的发生: EAR TIME

更多释义

• 1.各个政府部门的服务都是不定期的。
  Services were irregular across authorities.
  dict.yoduao.com
• 2.我们可以不定期的随访但效果毕竟有限。
  We could spring unscheduled visits but their effectiveness was limited.
  dict.yoduao.com
• 3.遗憾的是我们不能调整海湾上不定期的班船。
  Regretfully, we can’t regulate the irregular liner on the gulf.
  dict.yoduao.com

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