After struggling with the math problem for hours, I had a sudden light bulb moment and knew how to solve it.

在數學題上苦苦掙扎了幾個小時後，我突然靈光一閃，知道怎麼解決了。

Her presentation was full of interesting facts, but it was her final conclusion that gave me a real light bulb moment.

她的演講充滿了有趣的 M，但正是她的最終結論讓我真正茅塞頓開。