经过多次实验，他们终于证实了这个理论。

Jīngguò duōcì shíyàn, tāmen zhōngyú zhèngshí le zhè gè lǐlùn.

After many experiments, they finally confirmed this theory.

警方还在收集证据，暂时不能证实这条消息。

Jǐngfāng hái zài shōují zhèngjù, zànshí bù néng zhèngshí zhè tiáo xiāoxi.

The police are still collecting evidence and cannot yet confirm this piece of news.