唇不离腮

Explanation: Close analogy between, often stay together. 　　Source: Minglan Ling Xiao Xiao Sheng, "Jin Ping Mei," seventy-sixth back to what you do not have children, less lip is not separated from gills, still a child. " 　　Examples: What you do not have children, less is not the ~, still a child. (Minglan Ling Xiao Xiao Sheng, "Jin Ping Mei," seventy-sixth back)