Why is "within" used instead of "in" here? What's different between these two?
Native speaker’s answer
Rebecca
"Within" and "in" are both very similar but they have different nuances. To be "within" something means to be inside of something. It may also describe being inside of a boundary or a limit, often which someone is trapped between. To be "in" means to simply be inside something which does not necessarily have a boundary. Ex: The dog is within the fence. Ex: I am inside the house.