求翻译：在具体任务方面，美国国家地震灾害减轻计划规定的具体内容为，改善对灾害的了解、描述和预测；完善建筑法规和土地利用计划是什么意思？

Specific tasks, the U.S. National Earthquake disasters to reduce the specific plan for improving the understanding of the disaster, describe and predict; improve building codes and land use plans

In particular, the United States national earthquake hazard mitigation plan for the specific content and to improve the understanding of hazards and describe and predict; Improve building codes and land use plan

In the concrete duty aspect, the American country earthquake disaster reduces the plan stipulation the concrete content is, improves to the disaster the understanding, the description and the forecast; Consummates the construction laws and regulations and the land utilization plan

In terms of specific tasks, United States national seismic hazard mitigation plan requirements for specific content, improve understanding, description and prediction of disasters; improving building regulations and land-use planning

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