In recent years, "social sentiment and public opinion centers" have conducted investigations in a way that is relatively in line with academic norms, and have formed a complete data report, which has established a certain authority. However, these "public opinion centers" are either born of government departments or directly It is the subordinate agency of the government department, which is semi-official and determines its fundamental value orientation. What does this text mainly mean? ["The government's social sentiment and public opinion center have standardized investigative methods and authoritative data. The results of its investigation are worth affirming.", 'The findings of social sentiment and opinion centers at all levels are affected by the nature of their institutions.', 'The role of "polls" and their credibility should be reexamined.', 'The government should not interfere in "polls".']