Just as traffic backs up at some intersections only in heavy traffic, data can back up in your system in critical areas only when under heavy load.
正如繁忙交叉点处的流量需要备份一样，系统关键区域的数据也只会在负载量大时才会备份。
2
It just isn't realistic for these businesses to toss out a mission-critical core system and build a new one.
对这些商业交易来说，抛弃一个关键任务核心系统建立一个新的系统是不现实的。
3
Science may agree. Just two to three oysters deliver a full day'ssupply of zinc, a mineral critical for normal functioning of the male reproductive system.