1.  abiogenetic
2.  faculative
3.  adventive
4.  accidental

• 1. 偶发的: incidental | accidental | sporadic | adventitious
• 2. 偶发的时不时地发生: Occurring from time to time
• 3. 偶然发现的: serendipitous

更多释义

• 1.巴黎郊区偶发的骚动成为他的论据。
  Sporadic eruptions in the banlieues of Paris pose a challenge on his doorstep.
  dict.yoduao.com
• 2.相反，他看上去无趣、疲惫、偶发的焦虑并且有时甚至躁动不安。
  Instead he looks bored, tired, intermittently anxious and sometimes almost excited.
  dict.yoduao.com
• 3.如有偶发的经济事件发生时，本代理契约可经双方同意，作部分的修改。
  In the event of unforeseen economic developments, parts of the agency contract may be changed by mutual agreement.
  dict.yoduao.com

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