bulb 电灯泡
Since the invention of the light bulb, people sleep about 500 hours per year less than they used to.
自从灯泡发明之后,人们比没有灯泡的时代平均一年少睡500个小时的觉
bulb 电灯泡
Since the invention of the light bulb, people sleep about 500 hours per year less than they used to.
自从灯泡发明之后,人们比没有灯泡的时代平均一年少睡500个小时的觉
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