For example, for years psychologists advocated permissive child rearing, but later some changed their minds and admitted that their advice was a mistake.
Гэтэл одоо тэдний зарим нь дээрх аргыг алдаатай гэж хүлээн зөвшөөрөн, үзэл бодлоо өөрчилжээ.