不了解

wǒ bù liǎo jiě tā de xìng gé

我不了解她的性格。

I am not familiar with her character.

wǒ xiǎng nǐ bù liǎo jiě tā huì yǒu duō áng guì

我想你不了解它会有多昂贵。

I don't think you appreciate how expensive it will be.

nà shí wǒ bù liǎo jiě qí tā dì fang fā shēng de shì qing

那时我不了解其他地方发生的事情。

At that time I was ignorant of events going on elsewhere.