No, I don't. The positive proof is that no one has bothered to make contact with us.

不，我不相信。确切的证据就是我们没有接触过这种生物。

youdao

The explosion-proof cable drum adopts a novel slip ring group, guarantees enough contact area and compression strength, and better transfers current.

采用新型的滑环组，保证足够的接触面积和压紧 强度，更好的传递电流。

youdao

The entire switch without a moving contact surface has high explosion proof and waterproof function, meeting the requirement of chemical industries, coal mines, underwater, and milling working.

整个开关没有动接触面。所以具有较高的防爆防水性能。满足化工，煤矿、水下，制粉作业的要求。

youdao

Also note that if eligibility cannot be determined online, you may need to contact Microsoft customer support and provide proof of your PC purchase.

FORBES: Get A Windows 8 Upgrade For $14.99

In most states contact lenses can be sold only with proof of a valid prescription--either a written prescription or oral approval from an ophthalmologist or an optometrist, who make their livings largely from the stuff they sell, contact lenses among them.

FORBES: An Eye For An Eye

Lacking so far is direct scientific proof that wearing ultraviolet-blocking contact lenses will prevent long-term eye issues.

WSJ: Contacts Lenses That Let In Sun, But Block UV Rays