科研之友
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<正>Before electric lights were invented,people often relied1 on the moon as the main source2 of light at night.Maybe that’s why people everywhere noticed marks on the moon’s surface and came up with stories to explain them.在发明电灯之前,人们在夜晚常常依靠月亮作为主要光源。也许这就是为什么世界各地的人们注意到月亮表面的痕迹,并想出故事来解释它们的原因。
