Pre-Condition: UC1 has been executed successfully at least once.

前提：UC 1至少被成功执行一次。

Pre-condition: Portal and Business Integration servers are up and running

前提：门户和业务集成服务器准备好并处于运行状态

Pre-Condition: Invalid order encountered during the successful execution of uc3.

前提：成功执行uc3过程中遇到无效订单。

At last, the cable force and displacement of the bridge is basically returned pre-condition.

最后，换索后索力、位移基本恢复到换索前状态。

So, to grasp its writing characteristics is the pre-condition for conducting successful business.

掌握它的写作特点是顺利进行商务活动的前提。