凶手作案时心里是怎样想的，这个问题只能由人们去推测了。
What was going through the killer's mind is a matter for conjecture.
《牛津词典》
推测不是我的问题。
The speculation is not my problem.
youdao
但该类问题推测属于NP完全问题。
However, this kind of problem is conjectured to be a NP complete problem.
在DSP应用中，经常要遇到推测未知数据问题。
Inferring unknown data is often met in DSP application.
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