He can't explain this problem clearly.

他没有说清楚这个问题。

youdao

He is merely filled with an inner rage he can't explain.

他仅仅是内心充满无法解释的愤怒。

youdao

I can't explain such a statement by him on the basis of logic. He must have blown his top.

我从逻辑推理方面解释不了他讲的这番话，他想必是神经错乱了。

《新英汉大辞典》

You can explain to the waiter that he has made a mistake by using the "I didn't" pattern.

你想跟服务员解释，他弄错了。你就可以使用“I didn't”句型。

I didn't 课堂 - SpeakingMax英语口语达人

Woodson, for his part, says he "can't explain" why Anthony is trying so hard.

WSJ: The Knicks' Defensive Revolution

The best guitarist in town may have once jammed with Carlos Santana, but that doesn't mean he can explain what you need to know, in terms you will understand.

WSJ: How a Middle-Aged Dog Learned New Guitar Tricks

"I spoke to the players and I can't explain it, " he said.

BBC: Burley not under threat, says SFA