And second question is that if i buy cubase 10 pro, can i use activation code with two different computers which they are belong to me?
Yes, you can use EDU discount. With every license stored on a USB-eLicensers (which is always the case of Cubase Pro), you can install Cubase to multiple computers. Where do you plug your USB-eLicneser with the license in, you can start your Cubase. So simple answer: yes.