" But this is unproven so far."

“但到目前为止，这还没有得到证实。”

There's acupuncture... - Those are all unproven.

还有针灸 -那些都是没有理论依据的。

Many feel the technology is too new and unproven.

很多人觉得这种新的科技太新了且没有被证明。

Some were passed down for generations and are still unproven.

有些是祖祖辈辈口口相传的，尚未经证实。

" This is a very costly proposal for an unproven program."

华盛顿特区财政政策研究所(dc Fiscal Policy Institute)所长埃里卡·威廉姆斯(Erica Williams)表示：“如果开发商认为有利可图，即便没有激励，也会这么做。”“对于一个未经证实的项目来说，这是一个非常昂贵的提议。”

The reasons for the decreased longevity in the North remain unproven.

北方造成寿命下降的原因目前尚不清楚。

But another is that the brain-stretching potential of edtech has remained unproven.

但还有一个原因是教育技术提升才智的潜力尚未得到证实。

Before Hubble, black holes were merely a concept, an unproven part of astronomical lore.

在有哈勃之前，黑洞仅仅是理论上的概念，是一项未经证实的天文知识。

Lula blamed Bolsonaro for inciting his supporters with unproven claims about possible election cheating.

卢拉指责博索纳罗利用未经证实的有关他可能在选举中作弊的说法煽动他的支持者。

They have commented on two unproven case reports from medical publications released many years apart.

他们对相隔多年发布的医学出版物中的两份未经证实的病例报告发表了评论。