"辊间距离" can be translated as "distance between rolls" or "roll gap" in English, depending on the specific context.
"Distance between rolls" is a straightforward and general term that describes the space between two rolls.
"Roll gap" is a more technical term often used in the context of rolling mills or machinery where rolls are involved, referring specifically to the gap or space between the rolls.
In most industrial or technical contexts, "roll gap" would be the more appropriate and commonly used term.