a rule or standard of good behaviour that, unfairly, some people are expected to follow or achieve but other people are not

The governor is being accused of (having) double standards in being tough on law and order yet allowing his own cabinet members to escape prosecution for fraud. 人们指责政府施行双重标准，一方面严格要求法律和秩序的贯彻和遵守，另一方面却对议员们的欺诈行为不予追究。