的时限价值或情况的范围，尤指曝光范围，在此期限内摄影用的底片能产生可用的影象。
A range of values or conditions, especially the range of exposures over which a photographic film yields usable images.
用例根据客户情况或问题而开发，其构成包含角色、目标和商业价值。
Use cases are developed from a customer scenario or issue, with role, goal and business value as its constituents.
管理团队负责确保首先消除最高的风险，以及产品或计划价值能够按照开发进展情况来定期度量。
The governance team is responsible for ensuring the highest risks are removed first and that product or program value can be measured regularly as development progresses.
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