Only one witness could make a positive identification.

只有一位目击者能够明确指认。

《牛津词典》

Choose a hero, so that in the face of adversity you can maintain a positive identification.

选择一个楷模，这样，在面对逆境时你就可以保持积极的心态。

youdao

Confirmation that the debris came from the Airbus 330 cannot be made until some of the material is retrieved and positive identification is made.

必须要在打捞上一些物品、并作出鉴定之后才能确认这些碎片是否来自这架空中客车A330。

youdao

He is being held in Quito, Ecuador's capital, pending positive identification.

CNN: Top FARC suspect reportedly captured in Ecuador

No remains will be released, however, until positive identification is achieved.

NPR: New Orleans Begins Probe into Katrina Deaths

Another problem that is likely to contribute to spam is that it is quite easy to create bogus accounts for the Ping service because no credit card or other positive identification is required to participate.

FORBES: Apple's Ping Plagued By Spammers