Mystery shopping is a tool used externally by market research companies, watchdog organizations, or internally by companies themselves to measure quality of service, or compliance with regulation, or to gather specific information about products and services. 

“神秘购物”是市场调查公司和监管机构的外部调查工具，也可以由公司作为内部调查使用，以衡量服务质量、是否遵守规则，或作收集产品和服务的特定信息之用。

The mystery consumer's specific identity and purpose is generally not known by the establishment being evaluated. 

被评估的机构一般不知晓神秘顾客的特定身份和目的。