杀人动机是什么？
It is still unclear what the motive for this attack was.
目前还不清楚发动这次袭击是出于什么动机。
What makes life dreary is the want of motive.
没有了原动力，生活便会沉郁无光。
What matters is the motive and the motive must be of a certain kind.
动机才是动机，而且必须是某种类型的动机。
What makes life dreary is the want of motive.
缺少动力将让生活无聊乏味。 。
What makes life dreary is the want of motive.
黯淡的生命，乃是缺乏志向。
What makes life dreary is the want of motive.
黯淡的生命，乃是缺乏志向。
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