total slack time meaning in English

总时差

By default , a critical task has zero total slack time , which is the amount of time a task can slip before it delays the project finish date
在默认情况下，关键任务的“总时差”为零，所谓总时差是指一项任务在不影响整个项目完成日期的前提下，可以拖延的时间。
Total slack is the amount of time a task can be delayed without affecting the project finish date . noncritical tasks have total slack time ; critical tasks do not . noncritical tasks can finish later than their scheduled dates without delaying the project finish date
“总时差”是延迟该任务时不影响整个项目完成日期的允许时间。非关键任务有总时差，而关键任务没有。因此非关键任务可晚于日程排定的日期完成，且不延迟项目的完成日期。