Front-line workers, service workers or migrant workers are the majority of our "people. " Most workers feel the advantages and disadvantages of the social system mainly through social security, social security, and wages and benefits of the employer. This part of the interests cannot be protected, and naturally there will be some dissatisfaction, the longer the accumulation, the stronger the anti-social tendency. A harmonious society should be a society in which the interests of all parties are continuously and effectively coordinated, and dissatisfaction should be resolved in time to avoid Evolves into confrontational contradictions, causing social instability. What is the main argument supported by this passage? ['Let workers enjoy dignity.', 'Industrial relations are the most basic social relations in contemporary Chinese cities and towns.', 'The pursuit of social justice in a harmonious society.', 'Labor relations need to be transformed.']