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

在数学题上苦苦挣扎了几个小时后，我突然灵光一闪，知道怎么解决了。

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

她的演讲充满了有趣的 M，但正是她的最终结论让我真正茅塞顿开。