There is no conclusive proof.

没有确凿的证据。

youdao

Iran claims to have put a satellite in orbit recently, but there is no conclusive proof.

伊朗宣称最近已经把一颗人造卫星放入轨道，但是没有确凿的证明。

youdao

This isn't conclusive proof of anything, of course, but it's a nice bit of deduction and just might turn out to be true!

这并不能确切地证明任何事，当然，这依然是一个很好的推理，而且很可能成为事实！

youdao

It does not offer conclusive proof that this is causing a rise in asthma.

BBC: NEWS | Health | Cleaning products 'wheezing link'

After all, there is little conclusive proof that Bigfoot is anything but a myth.

BBC: On the trail with Bigfoot-hunters

But there has never been conclusive proof there are big cats roaming wild in the countryside.

BBC: 'Big cat' probe after sheep death in Pembrokeshire