Recognize that if you use multiple job spools and spool your back-up job, you cannot be assured that all other jobs will be complete before the back-up job is started.
如果使用多个作业假脱机，而且对备份作业进行假脱机，那么就无法确保在备份作业开始之前完成所有其他作业。
You may choose any item from a particular floor, or may choose to go up to the next floor, but you CANNOT go back down except to exit the building.
你可以在任何一层选择任意商品，你也可以选择登上下一层，但是，你不能往回走，除非你要离开商店。
Integrated disease surveillance is the smart approach but, with dengue, you cannot simply "piggy-back" on systems set up for other mosquito-borne diseases, like malaria.
进行综合疾病监测是聪明的做法，但对于登革热来说，不可能简单地由为疟疾等其它蚊子传播疾病设立的系统来“背负”对该疾病的监测工作。
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