3 sentences

1. 这是一个已知的事实。

   zhè shì yī gè yǐ​zhī de shì​shí.

   This is a known fact.

   Source: Dong Chinese Dictionary

2. 她有什么已知的仇人吗？

   tā yǒu shén​me yǐ​zhī de chóu​rén ma?

   Does she have any known enemies?

   Source: OpenSubtitles

3. 这是人类已知的最为危险的战争的基础。

   zhè shì rén​lèi yǐ​zhī de zuì​wéi wēi​xiǎn de zhàn​zhēng de jī​chǔ.

   This is the basis for the most potentially dangerous warfare known to mankind.

   Source: OpenSubtitles