两道防线

使用Windows的访问控制表（ACL）所提供的安全机制和数据库的触发器控制技术，分别在数据库的外部和内部构筑了两道防线，把数据库的安全性提升到一个较为理想的状态。

To enhance the security of database to an ideal degree , also construct two defense lines both outside and inside the database with the safe mechanism provided by the ACL in Windows and the trigger in the database .

因此分析少筋砼结构的可靠性必须考虑两道防线失效的相关性。

Thus , the correlation between two limit states of rare-reinforced concrete structure must be considered in the reliability analysis .

对于两道防线且导弹兵器数目较少时，可采用完全枚举方法；

On condition that the number of missile weapon system is less in two lines of missile defence , it can be solved by an entire enumerate method .

构筑两道内部防线；

To form two internal lines of defence ;

构筑两道内部防线；论信息安全的道德防线

To form two internal lines of defence ; On the Moral Defense of Information Security

构筑石油安全防线构筑两道内部防线；

Set up an Oil Safety Prevention System to form two internal lines of defence ;

支撑框架刚度较大，具有两道纯抗震防线，适应于抗震设防较高的地区。通过有限元软件ANSYS对6层框架进行动力分析，比较这三种框架的抗震性能。

Braced frames own high stiffness and two lines of seismic-resistant defence , and adopted in high seismic-resistant area , then analyzed the dynamical properties of 6-story frame by finite element software ANSYS , compared the seismic-resistant properties of these three types of frames .