No one has come up with a definitive answer as to why this should be so.

至于为什么该这样，还没有人给出明确的答复。

《柯林斯英汉双解大词典》

youdao

This question remains unanswered; indeed, taking all the evidence into account, one cannot make a definitive statement about dinosaur physiology on the basis of dinosaur bone.

这个问题仍然没有答案；事实上，根据所有证据，我们不能基于恐龙骨骼对恐龙生理学做出一个明确的声明。

youdao

She urged the Tehran government to give a definitive answer to an offer by major powers to further process Iranian enriched uranium outside that country to resupply a Tehran reactor, running low on fuel, that produces isotopes for medical purposes.

VOA: standard.2009.11.09

If you have this so-called base case, can we actually get to a definitive answer eventually?

如果有了这个所谓的基本条件，那我们最终,能得到一个明确的答案吗？

哈佛公开课 - 计算机科学课程节选

"I really cannot give you an answer in terms of a definitive date by which we are going to be done,"

VOA: standard.2009.09.15

The Bills' message was less definitive a little over a week later at the NFL combine in Indianapolis.

WSJ: Bills QB Fitzpatrick, OG Levitre futures in limbo

But Roy Miller said that she had not received so definitive a diagnosis, and that, in any case, it could be difficult to sustain in court the notion that Amy was beset by extreme delusions.

NEWYORKER: A Loaded Gun

Inc. (NASDAQ:YHOO) and Alibaba Group Holding Limited today announced they have entered into a definitive agreement for a staged and comprehensive value realization plan for Yahoo!'

ENGADGET: Yahoo to sell back half of its Alibaba stake for $7.1 billion