求翻译：突变点前后国家政策的核心工作侧重点有所不同，1952-1976年我国一直处在社会主义探索阶段，国家政策的核心工作是以阶级斗争为纲、僵化半僵化、封闭半封闭的状态，而1976年之后，我国发生了以经济建设为中心、全面改革、对外开放的历史性转变。是什么意思？

The core focus of the national policy before and after the mutation point different from 1952 - 1976, China has been in the socialist stage of exploration, the core work of the national policy based on class struggle as the key link, rigid and semi-rigid, closed the half closed state, and after 1976

mutation is the core of the policy states before and after work has been focused on different, 1952-1976, our country has been in the exploratory phase, the National Socialist policies of the core work is the class struggle as the key link, rigidity and semi-rigid, closed and semi-closed, and the st

Around the point of discontinuity the national policy core work emphasis point differs from, 1952-1976 year our country always occupies the socialism exploration stage, the national policy core work is take the class struggle as the outline, ossifies half ossification, seals up half seal the conditi

Mutation points around the central focus of national policies differ, 1952-1976 has been in the exploration stage of socialism in our country, national policy is the core work of taking class struggle as the key link of semi-rigid and rigid, closed half-closed state, since 1976, have taken place in

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