puzzle over

She puzzled over the postmark on the letter.

她想弄明白信封上的邮戳。

They puzzled over the question for quite a while.

他们苦苦地想了很久。

The old general was puzzling over the old map.

老将军对着那张旧地苦苦思索着。

He puzzled himself over the matter.

他对那件事绞尽脑汁。

She was puzzled over the decision.

她觉得难以理解。

I puzzled over the problem for ages before the light suddenly dawned on me.

我对冥思苦想了很久才豁然开朗。