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同学们都知道,白天用英语说是“day”;晚上是“night”了,可是你知道“日日夜夜”怎样说吗?那就是“day and night”。
The classmates all know that it is “day” in English during the day, and “night” in the evening, but do you know what “days” are saying? That is “day and night”.