动机不明的 
unmotivated
- 我不得不提醒你他的动机还不明。
I have to warn you that his motives have lain hidden. - 而且自杀的自卫队军官一半以上动机不明,很难采取相应对策。
Moreover commits suicide Self-Defense Army military officer more than 50% motives are unclear, very difficult to take the corresponding countermeasure.
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