We do not fully understand how the brain is organized.

我们不完全了解大脑是怎样构成的。

《牛津词典》

Even if you highlight important points or take notes in a class, you probably do not fully understand what you learned.

即使你在课堂上用彩色笔标出中重点或记笔记，你都不一定能完全理解你学到的东西。

youdao

Avoid expressions in foreign language that you do not fully understand.

一定要避免使用外语中你不熟悉的字词。

youdao

However, the authors acknowledge that "we do not fully understand why the intervention was successful".

BBC: Text messages boost malaria care

However, scientists do not fully understand the relationship between air and sea temperature, and the melting of ice.

BBC: Polar expedition to study Antarctica's climate history

For reasons scientists do not fully understand, asthma rates have been increasing globally.

ECONOMIST: Climate change