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Time boxes allocate a fixed maximum unit of time for activities. That unit of time is called a time frame. The goal of time frames is to define and limit the amount of time dedicated to activities. Time frames are a common feature of many project management approaches, because they focus the team on the task at hand by providing a clear definition of completion. (时间盒为活动分配固定的最大时间单位。那个时间单位称为时间框。时间框的目标是定义和限制专用于活动的时间量。时间框是许多项目管理方法的共同特征，因为时间框通过提供明确的完成定义，使团队专注于完成手头的任务。)

“Continuous Integration”, “Continuous Delivery” and “Continuous Deployment”, are referred as an integral part of agile development. These approaches shares the same prefix ‘Continuous’, which suggests and allows integrating the increment (shippable software) as well as to deploy the outcome concurrently without the delay involved in traditional sequential development. (“持续集成”、“持续交付”和“持续部署”是敏捷开发不可或缺的一部分。这些方法共享相同的前缀“continuous”，这表明并允许集成增量（可交付软件）以及在不延迟传统顺序开发的情况下并行部署结果。)

Product Backlog refinement is the act of adding detail, estimates and order to items in the Product Backlog. Ongoing Product Backlog Refinement is needed within each Sprint to refine items to be ready for future Sprints. When the backlog items are refined to the suitable level of granularity, they fit to be implemented within one Sprint. (产品积压优化是向产品积压中的项目添加细节、估计和顺序的操作。在每个sprint中，需要不断改进产品待办事项列表，以便为将来的sprint做好准备。当积压工作项被细化到合适的粒度级别时，它们适合在一个sprint中实现。)