I can't understand a word she says.

她说的我一个字也听不懂。

《柯林斯英汉双解大词典》

No one is answering the phone—I can't understand it.

没人接电话，我不知道是怎么回事。

《牛津词典》

Mr Wu, I can't understand the ancient poem completely.

吴老师，我无法完全理解这首古诗。

youdao

"I don't understand. How can they have no record of her being there." "There has to be some explanation."

VOA: special.2009.06.12

If you are expressing an opinion, in other words, which differs radically from my own, I can't understand, according to Gadamer, whether or not you're being ironic.

换句话说，如果你在表达一个,与我所持观点彻底相反的观点时，葛达玛认为我并不能理解你是不是在讽刺。

耶鲁公开课 - 文学理论导论课程节选

I can't understand why he dumped his girlfriend.

我真搞不明白为什么他甩了他女朋友。

I can't 实战 - SpeakingMax英语口语达人

And I can't understand how (unintelligible) man ever let it end up this way.

NPR: Folk-Soul Singer Amos Lee in Concert

There were about three of them that were clear as anything and I can't understand why they weren't given.

BBC: Drogba rages at ref for Euro exit

"The decision by Ireland and Scotland smacks of childishness and I can't understand it, " said WRU group chief executive David Moffett.

BBC: SPORT | Rugby Union | Celtic League collapses over row