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.
在发明电灯之前他做了大量的实验。
He had done a lot of experiments before inventing the light bulb.
托马斯·爱迪生在失败了数千次之后才成功地发明了第一盏电灯。
Thomas Edison failed thousands of times before he succeeded in inventing the first electric lamp.
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