昨天是星期三。
It was Wednesday.
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今天是星期四。昨天是星期三，所以今天是星期四。
Today is Thursday. Yesterday was Wednesday, so today is Thursday.
今天是星期三，昨天是星期二，明天是星期四。
Today is Wednesday, Yesterday was Tuesday. Tomorrow will be Thursday.
昨天是星期几？是星期三。
What day was it yesterday? It was Wednesday.
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