There are many unanswered questions that can only be answered with more research.
有许多悬而未决的问题也许只能通过更多的研究来寻找答案。
This is a question that can still be asked and perhaps effectively answered.
这个问题仍然悬而未决，或许有人提出了有效的回答。
The question is one that can never be answered with any degree of certainty.
这个问题是不可能带任何确定性来回答的。
The question is one that can never be answered with any degree of certainty.
这个问题是不可能带任何确定性来回答的。
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