为了保证持久性，下文将要讨论的消息传递基础结构也使用了关系数据库表。
The messaging infrastructure, discussed next, also USES relational database tables for persistence.
由不胀钢制成非常低膨胀系数的样品载台保证温度变化对样品的位置没有影响。
A very low linear expansion coefficient sample carrier made from invar ensures that temperature change has no effect on the sample position.
为保证施工顺利进行，且提高安全性，对正反导井及扩挖系统进行了多项技术改进，提高了安全系数。
The some techniques of guide shaft and expansion excavation are improved for assure the successful construction and raise the safety coefficient.
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