Unreserved checkout let multiple developers check out the same file and make changes concurrently.
无限制的检出使得多个开发人员能够检出同一个文件并使得改动能够并发进行。
The second problem is more serious and should be of concern to anyone who's read Editing the Web: Detecting the Lost Update problem Using Unreserved Checkout.
第二个问题就更严重，需要关心谁阅读了可编辑Web：通过无条件的签出来检查丢失更新的问题。
As well as a simplified branching strategy, agile projects also tend to configure ClearCase to default to an "unreserved" checkout model.
敏捷项目不但提供简化的分支策略，它还倾向于配置clearcase默认为“无限制的”检出模型。
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