in,at,on这三个介词都可以表示时间,它们用法各异,非常容易引起混淆。为方便同学们记忆,请看下面:at几点几分,在三餐时,在中午或晚上,在……岁时on具体某天或某天上午、下午或晚上in年、季、月或泛指上午、下午或晚上 The three prepositions in, at, and on can all represent time. They have different usages and are very confusing. For the convenience of classmates, please read the following: at what time, at the time of the three meals, at noon or night, at the age of ... on a specific day or day morning, afternoon or evening in the year, season, month or Refers to morning, afternoon or evening