说明
day/days
核心问题
（1）All this was very interesting, but it was against the beliefs of some of the scientists of that day.
(2) Mike's methods were more advanced than those of the police of his ____. A. period B. day C. ages D. life
上两句中的 day 是否应改为 days? 因为只有 days 才做“时代”“时期”解。
词典解答
实际上单数形式的 day 也可作“时代”“时期”解，尤其在 of(in) the(that) day, of(in) my(his, her...)day 等短语里。
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In my day( = In the past), things were different. 我那个时代,情况是完全不同的。
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He got more closely in touch with the magazines of the day. 他与那个时代的杂志取得了更加密切的联系。
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It(Marxism) is the philosophy of human progress in our day. 马克思主义是我们时代人类进步的哲学。