此外，现在也不能确定工作的压力对他们的死亡负有责任。
There is also no certainty that the stress of the work contributed to their deaths.
至于他们是否是一对，我不能完全确定。
Whether they are labeling it as a couple, I'm not quite sure.
这可能是对的，但我不能确定。
如果你不能确定你的观众对已给议题有多少经验，尝试着满足大部分观众就好了。
If you're not sure how much experience the audience has had with a given subject, try to meet them somewhere in the middle.
谁该对机器的安全负责，这问题是个不能确定的灰色领域。
Who should take a responsibility to machines' security, which is an undefined greyness field.
但现在经济学家对未来不能确定。
但现在经济学家对未来不能确定。
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