英语中at in on 与时间词一起连用时该怎么用？请拓展讲 谢谢

at:接时刻(at 8)或接含”festival"的节日（at Spring Festival)
in:接年或年月（切记不可接年月日）（in 1992,in May,1992)
on:接年月日（in 5th May ,1992)或接含”day"的节日．(on National Day)

in 可以接段时间表示将来 we will have robots in 100 years
接点时间表示过去某时候 the computer was invented in 1946.