关于in three days是指三天内还是三天后in a year有在一年后也有在一年内的意思,那么in three days呢?P.S：我的老师为什么说意思是 在三天后.......

my mum will arrive within three days my mum will arrive in three days My mom will arrive in three days. My mom will arrive three days

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内。
可能他说错了。

不同语境有不同的意思，可以是三天内，也可以是三天后

in three days 指“在三天之内”可以使已经过去的三天 也可以指未来的三天,但这三天必须是连续的三天.语境不同有时解释也不一样

可根据语境来考虑 in three days 的意思