The light bulb was broken, so I lit some candles instead.
灯泡坏了,所以我点了些蜡烛。

When was the light bulb invented?

电灯泡是何时发明的？

Thomas Edison invented the light bulb over a hundred years ago.
爱迪生在一百多年前发明了电灯。

I think the most helpful invention is the light bulb.

我认为最有用的发明是电灯泡。

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