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中国政府向来重视粮食安全问题，自古及今皆是如此。然而，不同时期粮食安全面临的问题和解决问题的途径也是显著不同的。过去的相当长时期，中国的粮食生产一直存在以下问题：（１）实行了计划体制，生产效率低下；（２）投入水平和科技支撑能力非常有限，短缺成为常态；（３
The Chinese government has always attached great importance to the issue of food security, which has prevailed since ancient times and today. However, the issues facing food security in different periods and ways to solve the problems are also significantly different. For quite a long time in the past, China’s grain production has always had the following problems: (1) The planning system has been put in place and the production efficiency has been low; (2) The investment level and the limited scientific and technological support have made the shortage a normal trend; (3)