3 sentences

1. 我们对茶的起源知之甚少。

   wǒ​men duì chá de qǐ​yuán zhī​zhī​shèn​shǎo.

   We know very little about the origins of tea.

   Source: CCMatrix

2. 关于朝鲜的生活我们知之甚少。

   guān​yú cháo​xiǎn de shēng​huó wǒ​men zhī​zhī​shèn​shǎo.

   We know very little about life in North Korea.

   Source: CCMatrix

3. 问题在于，我们对人类大脑知之甚少。

   wèn​tí zài​yú, wǒ​men duì rén​lèi dà​nǎo zhī​zhī​shèn​shǎo.

   The problem is that we know very little about the human brain.

   Source: CCMatrix