期限日期用于指示您不希望错过的目标日期，而且在前置任务更改时不会要求您设置可以影响日程排定的任务限制。
Deadline dates are used to indicate a target date you don't want to miss, without requiring you to set a task constraint that could affect scheduling if predecessor tasks change.
差异通常包括外部前置任务或外部后续任务的开始日期或完成日期的更改，一般是由于工期、限制、跟踪进度等更改引起的。
Differences usually include a new start or finish dates for the external predecessor or external successor, typically the result of a changed duration, constraint, tracked progress, and so on.
有多少任务需要其他任务作为前置条件？
一旦一个行为被创建并被挂起，那么自那时起其任务就是要决定它什么时候应该被激活，状态控制文件里包含了它被激活的前置条件；
Once a behavior is created in a pending state, its duty from then on is to decide when it can activate, since it contains its own activation requirements.
利用评估工作流引擎，实现对工作流中任务前置条件的评价。
Evaluation of precondition for tasks in workflow was implemented by evaluating workflow engine.
利用评估工作流引擎，实现对工作流中任务前置条件的评价。
Evaluation of precondition for tasks in workflow was implemented by evaluating workflow engine.
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