区域地壳稳定性是进行重大工程建设时必须研究的课题。

It is essential to study the subject for evaluating the regional crust stability before a large and important project is established.

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大型锻件是国家重大技术装备、重大工程建设所必需的重要基础部件。

Large forging is an important basic subassembly which is necessary for many national major technical equipments and projects.

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一批重大技术难题的攻克，解决了国家重大工程建设急需关键技术和设备。

Finding solutions to major technical difficulties has led to the birth of key technologies and facilities urgently needed by key State projects.

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