To help answer this question, you must actively collect and maintain a baseline: extensive information about the state of the system at a time when that system is operating normally.

要帮助回答这个问题，您必须主动地收集并且维护一个基准：有关系统正常运行时的状态的广泛信息。

youdao

Keep touch with customer regularly and answer the customer question on billing actively. Make appointment with customer to identify payment time within credit period;

保持与客户的经常性联系，主动为客户解决帐单疑问，并在给予客户的信用期限内与客户预约付款时间；

youdao

The last link was the knowledge question and answer link; schoolmates were all in very actively participation in this activity, which in return helped them expand their fire related knowledge.

最后一个环节是知识问答环节，同学们都很踊跃的参加到这次活动中来，增长了对于火灾的有关知识。

youdao

While this is a hard question to answer, some of the companies that are hiring most actively (based on public posts) include Knewton to Udacity and Coursera.

FORBES: EdTech Dream Jobs: Doing Good While Getting Paid