the practice of watching a person who is getting money from a machine, filling out a form, etc., in order to find out their personal information 肩窥（窥视他人从提款机取款、填表等以了解其个人信息的做法） The PIN numbers were obtained by shoulder surfing. PIN码是通过肩膀冲浪获得的。 Learn how to spot shoulder surfing. 了解如何发现肩部冲浪。