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科学家花了将近80年的时间才发明电灯泡。
It took scientists nearly eighty years to invent a light bulb.
但是，在他发明电灯泡前，他试了为数千次去找一个合适的线。
However, before he invented the bulb, he kept trying for tens of thousands of times to find a suitable wire.
假如爱迪生100年前没有发明电灯泡，我们今天还生活在黑暗中。
If Edison hadn't invented the bulb 100 years ago, we would still be living in darkness today.
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