How to shield the difference among the distributed heterogeneous database is the primary problem to be solved to implement the mutual visiting among the multiple databases.
如何屏蔽分布在不同站点上的异构数据库之间的差异，是实现多个数据库互访要解决的首要问题。
Shield tunneling method has become a primary method in underground excavation with its predominance, earth pressure balanced shield tunneling (EPBS) is the most universal type in our country.
盾构隧道法开挖凭借自身的优势成为城市地下施工的主要手段，其中土压平衡式盾构目前在国内使用较为普遍。
Its shielded box should be used the main air gap and prevent the primary current to produce the magnetic field concentrating in the shield shell metal plate.
其屏蔽盒应用主气隙，防止原电流产生的磁场集中在屏蔽壳的金属板内。
Its shielded box should be used the main air gap and prevent the primary current to produce the magnetic field concentrating in the shield shell metal plate.
其屏蔽盒应用主气隙，防止原电流产生的磁场集中在屏蔽壳的金属板内。
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