To surf by touch requires the user to be able to feel depth or hardness; this ability was realized with the first electrorheological tactile mice but never marketed.
以触摸的方式来上网要求用户必须能够感觉到深度和硬度，这种能力曾在第一款电流变触觉鼠标上实现过，但该款鼠标一直没有上市。