They seldom eat out on school days.此处的on为什么不用in?in不是加一段时间的吗?

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They seldom eat out on school days.
此处的on为什么不用in?in不是加一段时间的吗?

同学,才看到你向我们团队发来的求助题,虽然已经有人回答了,但是为了向提问者负责,我还是要回答.
要了解介词on和in的区别,on一般用在具体某一天,某个日期,某个星期,某个节日前面,如on Saturday,on February 20th,on Children's Day等,而school day是指上学日,其中的第个上学日也是具体的某一天的,on school days 是指在所有的上学日.而介词in 一般用在上午,下午,晚上等时间状语前面,如in the morning / afternoon / evening 等.
另外,on + 星期的复数也是指在所有的星期几,或每逢星期几,如
We go to the park on Sundays.每逢星期天我们就去公园.
王牌英语团

on 用在日子上代表“所有的，每个”意思

比如 on Tuesdays 每个礼拜二，每周二

on school days 指“所有上学的日子”，意思是节假日之外

They usually have lunch at school .They seldom eat out on school days.翻译 They seldom eat out on school days.此处的on为什么不用in?in不是加一段时间的吗? the old scientist seldom goes out ----(eat)in the evening. They used to go out to eat.( The Greens (seldom) eat out.(对括号部分提问）3Q eat out He seldom ___(eat) fruit and vegetables. Healthy people seldom eat much snacks Healthy people seldom eat much snacks.中文翻译英译中：Healthy people seldom eat much snacks. They seldom play computer games .(对 seldom 提问） They seldom play computer games.对 seldom提问 they seldom come here的反义疑问句 eat out 啥意思 eat out of our eat out的意思 seldom eat vegetables and fruit哪里错了 I seldom eat cakes or _____(sweet）.