1. 偶然事件：Hampel M-estimators, 汉佩尔M估计量 | Happenstance, 偶然事件 | Harmonic mean, 调和均数

2. 意外事件,偶然事件：vascular 脉管的,血管的 | happenstance 意外事件,偶然事件 | venture 冒险,敢于做或说,大胆表示

3. 第八集：第七集:Post.Mortem | 第八集:Happenstance | 第九集:Living.Legend

4. happenstance的解释

4. 雙胞命案：707 身後之事 Post Mortem | 708 雙胞命案 Happenstance | 709 傳奇人物 Living Legend

1. 偶然情况;巧合
    If you say that something happened by happenstance, you mean that it happened because of certain circumstances, although it was not planned by anyone.

    e.g. I came to live at the farm by happenstance.
           我来到该农场住下纯属偶然。

1. an event that might have been arranged although it was really accidental

    Synonym: coincidence